Have you been out today?

Overwhelmed though I was by the response to my request for suggestions for future theme weeks I've chosen September's theme myself and I need your help with it. I want to do a week of illustrated rubbish jokes but I only have one suitable such gag in mind at present. Please, therefore, send me (by email please, not via comments) your favourite bad jokes. Probably best if they're very short (and preferably interesting to illustrate).

Extra brownie points will be awarded for anything that begins with a polar bear walking into a bar.

Go to it, people. Meanwhile, I'd better draw today's chicken.