He derives!
The aftermath
They both need a *break* every once in a *while*. edit: this is a three-way pun btw - it works better out loud
Because they're always trying to find the x. They don't know y, either.
Because he left a residue at every pole.
Because they don't have the necessary koalafications. (Derived from: )
He knew better than to drink and derive.
