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:

The Substitute by EEPERS 6-24-08

Why do you keep clicking refresh? Why can't we just make a comic already? Because there are supposed to be two Asian kids, not this dude. What's wrong with my computer? Nothing is wrong with your computer! The other girl quit, so Mr. Popcorn is substituting for her. Hello. Hey. No eating allowed, Mr. Popcorn.

Please tell me what you think.

I would argue that this is better

The BIG Argument by EEPERS 6-24-08

BlLUEBERRIES ARE PURPLE! No, they're blue! That's why they're called BLUEberries! The people who gave them the name "blueberries" had no idea what they were talking about! STOP IT, YOU GUYS! Blueberries are purplish-blue! No, they aren't! They're just purple! Stop trying to solve the friggen problem! I'm not! I'm trying to find my own place in the argument!

---
Batman created by Bob Kane

The Consequences of a Bet by EEPERS 6-24-08

I won the bet. Now get straight down to business. Alright, alright. But let me remind you I'm only doing this because I'm a good person and I'm keeping my end of the deal. Yeah, whatever. Just remember you have to fill the whole box. Fine. You've still got half the box to go. I knew I should've had a bigger breakfast.

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.

Just the Everyday Quarrel by EEPERS 6-25-08

I AM NEVER SETTING FOOT IN THIS HOUSE AGAIN! I AM NEVER EVER EVER COMING BACK! I guess he really means it this time. I've made my one and only roommate leave. What are you looking at? I forgot my keys!