Cartoon: Wipe the Slate Clean

Cartoon of a boy and teacher. The boy says, "It's hard to wipe the slate clean when you use a permanent marker."

I've often heard people say, "I'll forgive, but you better believe I won't forget." It is a difficult thing to do, isn't it. If I've slighted you, I hope you've forgotten about it. It wasn't on purpose... honest!

I drew this in Adobe Illustrator CS3.