My sister loved to prank me when I was younger. She was 4 years older than me and I was pretty gormless so she found pranking me easy.
The ones I remember clearly. I was sitting eating an orange, fiddling with it and everytime I squeezed a bit of it she would squirt me with a water gun from across the room. I thought all the liquid was coming from the orange! (I don't get how I didn't taste it was water, and how she just happened to have a water gun on her)
Bursting cod liver oil capsules and rubbing it on doorknobs.
When I was sitting down she would sneak up behind me and hover her hand above my head. It would make my head/hair feel weird and when I would put my hand up to feel my head, she would grab it and I would shit myself.
Sewing the head and feet of my pajamas closed.
Not a prank, but equally as evil. When I was 10 my friends mum invited me on an outing with her daughter as a birthday present for me. Turns out, just taking me out was the present and she wanted money for what she organised. I was really embarrassed to tell my parents so borrowed the money from my sister. I couldn't pay my sister back so instead I had to dance as payment, when and where she wanted in the style of her choosing.... It was mostly reggae style dancing as that was popular when I was a kid.