Mouths and mouse pointers

At Glitter's Cap-Page Board, it has become a recent trend that, whenver a screengrab shows a character with their mouth open, various cappers will see if their mouse pointer will fit inside the open mouth. Of course, success depends on the size of the capper's pointer and screen resolution.

Here's the caption that started it all, during The Devil's Rejects:

http://www.capperwiki.com/wiki/images/c/cf/Dvl22.jpg
AntiHero:
Wow, i can fit the whole mouse pointer in her mouth.