when you have tun out of ways and alterations of qwertyuiopasdfghjklzxcvbnm so you just type tererer.
"dude you look braindead"
"tererer"
How your grandpa thinks R2D2 is spelt because back in his day they didn't have those stair wars.
"Gramps! who's you favorite movie character?"
"Well I sure do like that ar too dee too"
'WTF gramps"