Dangerous costumes and brain vomit

I'm skipping the intro today.  Comic goodness awaits.

Off the Mark:

The play seems to be going well given the circumstances.  The kid looks a bit confused, but the rest of them are into it.  At least she didn't make him a Cleveland costume.

Baby Blues:

Most parents would name the drawer "The Dangerous Drawer" themselves in order to keep their kids out of it.  Of course, that usually makes the kids more curious and they end up getting into it and hurting themselves.  If the kids name the drawer themselves, then they're more likely to stay out of it.

The best way to make your kid curious and to get into the Dangerous Drawer and hurt themselves is to have a lock, duct take, and several signs that say "DANGEROUS DRAWER!" and "DO NOT OPEN!"
The best way to keep them out of it is to let them get hurt when they get into it.

Zits:

Controlling the vomiting of your brain is crucial while in school.  The proper thing to do is to hold it in and only let it puke onto the test.  The answers will all be there in their proper places, though they may be a bit messy and disorderly.  Do your best to keep your brain vomit legible, otherwise it will be of no use to you.

Brevity:

As often happens with Brevity, Guy and Rodd are referencing something that's way over my head.  The obvious point would be that she's saying that it tastes better if you eat your food in front of prisoners who can't get it.  That seems so cruel and awful that it can't be the joke.  I know Guy and Rodd have a bit of a sick sense of humor, but I wouldn't have guessed that it's that sick.

Therefore...  I have no idea what the joke is.  I'm guessing something about MSG and how that abbreviation could be for more than one thing, but I really can't be sure.