Basically just make your own 'roses are red' poem. Roses are red, Violets are blue, <insert your part> <insert your part> Lines 2 and 4 must rhyme. I'll start: Roses are red, Violets are blue, Man finds pringles In Cincinnati Zoo.
Not sure if anyone will appreciate this one, but I love it. I didn't come up with it >_> Roses are angiosperms, Violets are too, Sugar is C12H22O11, We know this from peer review. I'll come up with one though. Roses are red, Violets are blue, You're on sixth street right? I've been watching you.