Hey, wait a minute... the fourth strip in EGS (the one about hammers) explained a joke I saw somewhere a few weeks ago but didn't understand the time. I can't even remember the context or the joke...
I thought it was XKCD but a quick check through the archives revealed nothing. You didn't happen to post a strip containing earthquakes (I think it was earthquakes) and women-producing-hammers-from-nowhere, did you?