Some of the better-known arguments for God's existence are pretty lame. Stuff like Pascal's Wager and the ontological argument. Great writers as well as random people on the Internet just blow them out of the water.
Non-theists, have you ever heard a really compelling argument for God's existence, one that had you completely stumped until after you'd spent hours lying awake figuring out how to refute it? Or maybe you never figured out how to refute it. Theists, can you present me such an argument?
If you can't think of any of those, then how about the funniest or lamest arguments you've ever heard? I either want intellectual stimulation or laughter. Go.