It’s funny how you can think something (or someone) can be totally harmless…until the situation gets flipped on its head and you realize you’re dealing with something that’s actually dangerous.

And the world is full of this kind of stuff!

What seems harmless but is actually really dangerous?

Folks shared their thoughts on AskReddit.

1. Keep your eyes open.

“Walking along the train tracks.

It’s crazy how fast millions of pounds of freight can sneak up on you.”

2. Jeez.

“ER nurse here.

I had a teenage girl come from Home economics class. She was sewing and had a pin between her lips.

I mean , who hasn’t done that? She sucked it in and it got lodged in her throat. While waiting for a scope she felt it dislodge and went deep into her main bronchial. She required major surgery.

Had a young boy running with a toothbrush in his mouth. Got jammed way deep , almost hit a major artery.”

3. Ouch!

“A human bite.

I worked at a kindergarten and one kid was sometimes super sweet but sometimes really mean. He could switch in a second. While I was naming the colouring pages they were about to get he walked up to me and bit me in the arm. Didn’t think it was through, cuz no blood.

But it started swelling and getting red and the marks were clearly there. Went to the doc right after my shift. He explained a human bite is the second most dangerous bite there is. Got antibiotics but they didn’t work. Arm just kept swelling and getting completely dark purple over two days.

Doctor sent me to the hospital where I got strong antibiotics. Basically everything in me was cleaned with that s**t, felt weak for months. If it didn’t start working by that night is have to come back and be hospitalized to get my underarm removed. I’ve shat some bricks there.

Never thought a kid’s bite could cause this. Luckily the swelling got less and the bruise stopped spreading so I still have my arm, but that was very close.”

4. Gotta follow directions.

“Having a small snack before a medical procedure that requires anesthesia.

Intubation can cause you to throw up your food and you can choke.”

5. Be careful.

“Pool covers. It’s like being wrapped in a bedsheet underwater. You cannot get free and you cannot scream for help. Once you’re in the only way to get out is to be incredibly lucky and get free or have faith that someone saw or heard you fall in and hope that they get you in time.

It’s a lengthy, terrifying, d**th that’s completely avoidable.”

6. Wow.

“Having a loose animal in the car.

A safety instructor once told me doctors had to dig dog bones out of a person after it got between them and an airbag.”

7. Pretty scary.

“Oceanside cliff blow holes.

People think they’re so much fun to stand around and play with.

You fall into one of those things, you aren’t getting out.

The waves will just bludgeon you against the rocks until you d** or you’re lucky enough to drown first.”

8. Know your flowers.

“Kids picking flowers in the park. I am a conservation

Technician for a county park system, at least once a year I have to stop parents with kids picking flowers off the trail because I see kids with either poison hemlock (one of the d**dliest plants if ingesting even a tiny amount) or wild parsnip, which can cause some serious permanent scarring, burns, and boils if the sap gets on to your skin and is exposed to sunlight.

Don’t let your kids pick or eat anything you aren’t 100% sure of.”

9. No way I’m doing this.

“Confined spaces, above ground or worse, below the surface.

If you do urban exploration, caving, or anything like that, get a 4 gas detector, clip it to you chest or belt, and set the alarm to max.

If it makes a sound, get the f**k out or you are going to d**.”

10. Gotta do it.

“Not checking / changing the tires on your car.

Someone back me up on this.

You can’t just drive around with the same tires on forever.

Eventually you’ll end up doing donuts in the middle of a wet interstate because your back tires lost traction.”

11. I didn’t know that.

“Eating raw or undercooked kidney beans can make you very sick or even k**l you.

It only takes like 3 undercooked kidney beans to ruin your day.”

12. Could be very harmful.

“Small cuts you get when doing marine stuff.

If you are diving/snorkeling at a coral reef and lightly scrape yourself on some coral, for the love of god disinfect the living s**t out of that, no matter how “mild” it looks. The bacteria on coral will literally eat your leg off.

Having small cuts on your hand while handling stuff like diatomaceous earth or sea sponges can cause tiny glass spines to enter your blood stream and poke tiny holes in all those blood highways running through you.

While this is a bit of a he-said she-said story, my professor apparently had a student hospitalized and d** due to massive internal bleeding issues from handling this s**t day after day.”

What do you think seems harmless but is really dangerous?

Talk to us in the comments and let us know.

Thanks in advance!