Slap them in the face with chalk powder.

Tell them to "hide yo kids, hide yo wives, and hide yo husbands too because they be raping everybody up in here", given that they know what rape means.

Show them the video of the Russian lady picking up kitties from a bucket and tossing them to drown in a river.

....

I just now realized that most of Rescreatu are kids and I'm pretty sure even reading some of these things have made them cry. If not, they are slowly becoming numb to the thought of all obscene, crude, horrific ways that are mentioned in this thread. 

Duct tape their mouths shut. Then crack rotten eggs on their head. That way you can get at least one open before someone notices, since they aren't screaming and all.

Trip them, then laugh. A lot.

Don't give them the TV remote.

When you're in charge for a while, don't let them eat anything. 'Cept for spinach or whatever they hate.

Hide their favourite toy(s).

Hide their pet if they have one. When they ask where it went, tell them that it ran away because it hated them.

Run around chasing them with a verrrry large butcher knife screaming "I'M GOING TO KIIILLLL YOUUU" murderously while also having murderous laughing interventions.

Given that they are not a big sharer, take the toy they are playing with and never give it to them no matter how hard they cry.  You can also laugh at them.  Or take their favorite toy, all their toys, etc.

Say, "Let's play a game!  You're the bad guy, and I'm the good guy!  The bad guy gets the gun, so here."  You give them their favorite toy gun, then snatch it out of their hands as soon as they start playing with it, then pick them up and put them in a closet and sit down against the door to make sure they won't get out.  Laughing helps.  Taunting helps, too.  No matter how hard they cry do not let them out.

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No, I'm not this mean. :c  I haven't done any of this.

Well, sort of.  My little cousin cried when I did things like this, but not meanly.  The third is an example.  We were playinga game, and he wanted to be the bad guy, so I gave him his favorite toy gun and we played and had fun.  But when it was HIS turn to go to jail (instead of me, lol, I let him put me in jail), I put him in the closet (um, no door handle, so it was peephole type thing and I had to sit against the door) and he started crying to let him out.  I did after a while.  I didn't want his parents to get all mad at me..

But uh, even if I take one of his toys he's not even playing with while he's watching a movie, he'll start saying "Heeyyy, dats myyyyy toyyy!!!" and starts crying.  Yeah, he's not too big on the topic of sharing.... :/

So yeah.  I'm not mean!!! D:

One way to make a kid cry...

Tell them how babies are REALLY made. xD 

Offer to polay Hide and seek. They hide in the cuboard. Then forget to find them

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Yes I'm this mean I have done this to my little cousin. He's 6.

Tell them there evil little rats

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This works with ILUV aswell

Get them to colour a picture for you and rip it and throw it in the garbage. ;<