The comic strip titles are my outlet for really bad puns. If I didn't have the titles, I'd put the puns directly in the strip. This way, readers can enjoy the other forms of humor while safely bypassing the majority of the wordplay. The titles are like lightning rods for cheesy jokes.
I don't always use puns or allusions to geek culture, though. I wonder if someone out there will be trying really hard to get the non-existent joke. "Metamorphosis...hmm...I don't get it"