My comics aren't that great since I'm not quite used to using already-made characters, but I gave a shot at it.  Here's my best one:

[Click to view comic: 'The Substitute']

Please tell me what you think.

I would argue that this is better

[Click to view comic: 'The BIG Argument']

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Batman created by Bob Kane

[Click to view comic: 'The Consequences of a Bet']

dcomposed

Yeah, I guess.  I should've reworded the punchline in the first one I posted.  When I added the "Mr. Popcorn", it didn't sound as great.

This is my newest comic.  It's bad, but I'm trying.

[Click to view comic: 'Just the Everyday Quarrel']