When I was a kid my brother taught me (falsely) that Giraffes could not bend their head below their body because their blood pressure to reach up their long neck was so insanely strong that if they dropped their neck too low their brains would explode. I for some reason took this as FACT. When I was in my 20s going to a zoo with friends we saw some giraffes and I noticed one put it's head down to drink water and screamed a little. My friends asked what the fuck and I told them my brother's "science" ... They could not stop laughing at me.