My latest comic is entirely based on a pun. And it was supposed to be terrible.
http://tapastic.com/episode/57431
Spy + Gyro = Spyro. And it also references the eponymous video game hero. I was actually inspired by the famous "Frying Nemo" picture, that I found several times on social networks and 9Gag.
What pun, that is so bad it's funny, did you put in your comics ?