My husband showed me "The Aveirah Song" by Lev Aryeh guys and I've been cracking up ever since. There's only one error in the song (that I could catch)- they pronounce the name Shmuel 'Shmuel' when they should pronounce it 'Shmiel.'
Anyway, click here for the amazing song. It's a Purim parody, and it's brilliant in the way Weird Al Yankovic and Lonely Island parodies are brilliant.
I made a shirt on CustomInk.com based on the song. I know that a snake is not a sheretz, but this was the closest I could find, so consider it a lizard.
Here's a picture.
And here's where you can see the full shirt (click for the link).