In 2001, I joined a website called Stripcreator, which has a bunch of stock art and a nifty generator that lets people with no artistic talent slap together a comic strip using other people's artwork. I, and a generous helping of other regulars, entertained ourselves and others (mostly ourselves, really) with our comic wit.
Most of the comics we created were just stuff off the tops of our heads, or snarks back and forth at one another. Sometimes we'd have competitions in the forums to create the best comics with crazy-ass rules like "Use every letter in the alphabet" and "Every panel must mention a different kind of cheese." Most of the comics we made for the competitions were shit, but sometimes there was a gem that was funny even if you didn't know there was a competition going on.
You do that for long enough, and you start to rack up quite an archive.