Asleep one night in the summer with my windows open, house is facing onto a quiet residential street. Around 2am something comes flying in my window and I yell "what the fuck", it's a soccer ball.

I look outside, nobody there, probably just some stupid kids. Go back to sleep. An hour later something comes else comes flying in the window - a brand new stick of butter still wrapped in foil. Look outside, they're gone. WTF but go back to sleep.

The butter incident happens several more times over the following months. One time the bell rang, my roommate opened the door and I hear her yell "I think it's for you". I go and look and there's a stick of butter on the door mat.

One day it happens again but we're more prepared, we see someone wearing a motorcycle helmet leave the butter and then bolt. My roommate chases him down the street and rips the helmet off, to find it's another mutual friend who we thought had left the country. The initial soccer ball + butter was just some random kids, but then my friend picked it up and ran with it. Going so far as to lie about flight dates for a vacation so that we'd think he was out of the country and not suspect him.

Also once watched a gas tanker slowly reverse over a sedan at a gas station and just crush it, while the owners are standing there watching.