TWO FOR ME:
My older stepbrother had restored a 1964 Corvair. It was beautiful.
I was just a kid and he'd been teasing me about something, so, as a joke, I found some yellow paper streamers from a birthday party, draped it all over his car and taped a big poster cut out lemon to the windshield.
Little kids don't watch weather reports and I didn't know it was going to rain. It did and streams of yellow dye ran all over his white paint job. I ran outside to clean it all off before he came back, but I couldn't get the yellow stains off. My heart was broken and I was in the front yard crying in the rain.
My stepdad, who had watched me do it, took pity on me, came out and helped me buff the stains off of the paint before my stepbrother got home. I fessed up later.
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Patroling all night can be boring at times, which is a good thing, because it means everyone is safe, but it can be hard to stay awake if all you're doing is driving around. So, from time to time, we would prank one another or stop at different departments for bathroom breaks, soft drinks/coffee, etc. One of our favorite places to take a break was at the office of one of the town marshals. But, while we were in the restroom, he would sneak into the bays and flip the switches on our lights/sirens so they would all go off when we started our cars.
So, very early one morning we decided to get him back. While he was in the restroom, one of us smeared Vaseline all over the earpiece of his telephone and I took the pad off of his deskchair, got it wet, squeezed most of the water out so you couldn't tell by looking that it was wet, and put it back.
We went out into the bay where our cars were and the marshal came on out to talk with us. About ten minutes later, we heard a very loud stream of profanities coming from his office. We immediately recognized the voice. Our boss, the Sheriff, had come out early, had radio trouble and had come in the other door...sat down ...to use the phone.
He laughed about it LATER and DID get us back.