1. Out of need.
2. Out of fear.
3. Out of panic.
4. Out of instinct.
5. As an initial prank, they knocked onto your doors and wanted to just shit on your floor and run away giggling, then listen behind the door as you discover the surprise and scream.
6. Out of revenge for you fucking their mothers.
7. Out of completely random phenomena, matrix glitch, a dream inside a dream except that if you get arrested while sleeping, you get arrested in real life.