When I was little,I used to prank my parents. Here is how I did it.
1. I would put the Blue Screen Of Death for my parents' computer backround.

You all know the blue screen of death. It is a screen you get on your computer. My parents would scream when I put that as their backround.
2. I would put PBS on the TV.
My parents would freak out when they saw the "And on,and on,and on!" PBS logo.
It scared them! Well,it scared me too.
3. I would show them my My Little Pony dolls.
They freaked out when they saw my Beddy-Bye eye baby ponies!
And last but not least.................
They screamed when they saw other scary TV idents (logos)!

Look! It's the S from Hell!
And the LBS Logo!

The V of steel joins the party..........
And so does the And On PBS Logo!

That happend at my 9th birthday. The logos played at my birthday!
They were on tape,yeah!