1) If offered food, eat all of it.
2) Complain about how hot it is outside and when you go inside, complain about how it's such a beautiful day outside and that you should be outside, enjoying the day.
3) Repeat everything they say.
4) Speak to them in a British accent. Fail terribly at it.
5) Hide in their closet. When they enter the room, fall out of the closet, and say:" So this is what Narnia looks like..."
6) If they ask you to help look for something, look around, pretending you're trying really hard to find it. Then, every 5 minutes, ask what you're looking for.
7) Say their name over and over again and when they get fed up and ask you why you're saying their name, say:"Hi." and stare at them intently.
8) Wake them up in the middle of the night and scream into their ears:"DO YA THINK SANTA CAME??!!" On a day nowhere near Christmas.
9) Send them edited pictures of people they hate kissing their idols.
10) Tell them how the movie that they are really excited to see ends.