1) Clog the toilets with multiple rolls of toilet paper.
2) Act like their house is your house. Take things and go into random rooms as you please.
3) Jump on the furniture.
4) Play multiple unfitting songs at full volume.
5) Eat all the food set out.
6) Ignore everyone and just sit there like a statue.
7) Loudly ask your parents every one or two minutes whether if you're going to leave soon.
8) Pour your drinks on their carpet.
9) Steal the sheets on their bed.
10) Scream, cry and thrash around like a 2 year old.
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How To Annoy People And Make Them Think You're Weird: A Guide
Randomhey (though i have written some chapters, not all of these mine, so credits go to the people who have written them)