The irrational fear of [palindrome]s (words that read the same forwards and backwards).
> Dude 1: Hey, what's your name?
> Dude 2: Bob.
> Dude 1: AAAAAAAAAAH! *Runs and hides behind sofa*
> Bob: Wow.
> Dude 1: AAAAAAAAAAH! *Runs away and falls down stairs*
