I am not really a great puller of pranks but can see the funny side when they are pulled on me.
When I was 12 I went through a phase of being a really sarcastic know-it-all (shiocker, right?) and my parents decided to get a little revenge and treat me some humility.
They planted a chocolate mouse under the book case in our living room, with just enough poking out that you could see it was a mouse but just obscured enough that with my poor eyesight I couldn't tell it was fake. Then during dinner when the whole family was sat together Mum let's out an Academy-award winning "Oh my god, a mouse, John (that's me) get it out of here!" I looked round and saw it and froze. I have no idea why, I didn't think I was afraid of mice and they don't bother me now, but I was totally frozen to the spot and made some excuse like "It's fine, leave it where it is." My Dad says "It's allright, I'll get it" He walks over to the mouse, picks it up and bites it in half. I swear to God I thought I was going to faint! Apparently the look on my face was a sight to behold. We all laughed about it afterwards and Munm and I still talk about it today.
I'm not sure that it worked as a lesson in humility and not being a snarky git, but it is one of the standout memories from my childhood.