October 25th is not National Kick Tall People Day, in fact it's National Stomp on Short people Day. On this day you get to stomp on your short friends.
"Hey, it's October 25th. You know what that means! It's National Stomp on Short People Day!"
*stomps on his short friend*
A metaphor for being the best at something that's unimportant or unimpressive. For example: The fastest pitcher who lives at a nursing home is like being the smartest kid on the short bus.
It comes from the special bus designated for retarded people commonly being shorter than the others.
Zack: I'm the best guitar player in town
Me: Whatever, that's like being the smartest kid on the short bus