1) My daughter and I play a game that is probably best called Vomit Tag. Generally it starts with me clutching my stomach and moaning "Ohhhhhh, I don't feel so good." I then stagger towards my daughter pretending to barely hold in my vomit which is seemingly fighting its way out of my stomach. My daughter then shrieks with fear, screams "DON'T VOMIT ON ME!!" and runs to hide behind the nearest piece of furniture/mother. I keep gagging and lurching towards her, and the game generally ends when I pretend to puke on her, running my hands down her head as though vomit were dripping through her hair.
This game is a derivative of our old activity, Sneeze Tag, which is almost identical. Substitute the gagging and lurching with lots of open-mouthed "Aaah! Aaah!" noises and you've got a very similar game. It ends with virtual snot dripping down her head.
Note that although I generally initiate Vomit Tag, sometimes she requests it.
2) Back when my daughter was in the womb, I entertained myself and my wife by speaking for the fetus. I can't quite describe the voice that I used because that would require actual writer-like skills, but imagine a growly and gravelly voice, more appropriate for a hobo than a baby, with the merest hint of a Mexican accent. I used this voice whenever I pretended to be her, and this continued, off and on, until she could speak for herself.
I used different but similar voices for her various toys and stuffed animals. Often the toys would get imbued with equally inappropriate personalities and occupations. For example, I named one of her toys Mr. Surly who was an actuary by trade and hated most everything. Now, although I admit to being rather sleep-deprived at this point in my life, I defy you to argue that this toy, pictured here:
wouldn't be angry. Look at him! What the hell is that? Christ, I'd be pissed too. Anyway, to this day when I play with my daughter, our interactions will often include silly voices.
Apparently my daughter now thinks that this is how one interacts with five year-olds. So, when she plays with her school-mates, she'll bring out the funny voices and generally imitate my schtick. The other kids are confounded by this behavior and either think she's weird or that she's making fun of them. The former may be true, but definitely not the latter.
So, I ask you, what's a dad to do?