Eating carrots doesn’t make your vision better.  Though your body does convert beta-carotene into vitamin A, it’s not enough to enhance the average person’s eyesight.  The myth comes from WWII propaganda, when England tried to hide their new radar technology by tricking the Germans into thinking British pilots had developed a special ‘night sight’ from eating a lot of carrots.  (, )
During the 1st live iPhone demo, Steve Jobs was secretly switching phones because they couldn’t even play a song without crashing.  Their displays were rigged to show 5 bars of signal strength and he had to use a portable cell tower just so they would seem reliable enough to make calls.  One little mistake could’ve ruined the entire presentation, but Jobs got through it flawlessly, and the iPhone was a hit before it ever actually worked.  (, )