Tap, tap.

[sesquapedalian]

As I was sitting on a toilet in the dowstairs bathroom of the Knight Library, my eyes happened to wander to that place near the floor where the divider is visible from both stalls, and to my great pleasure, I found that someone had scrawled, in big block letters:

"TAP FOOT 4 B J"

Mwahaha. I bet that's how horses ask for it, too.