Alright I found the best prank to pull on your friend.
You get their email and get the microsoft sam, (or you can download it)
You then type something in (cant tell you yet) and you make it a "screamer"
What you do is, you send random funny stuff to your friend till they actually turn their volume up.
Then you type your message and you send it to em (it works best to send to people with slow internet)
They then open it after turning up their volume and it screams
"
YOUR CHILD IS LOOKING AT GAY PORN
YOUR CHILD IS LOOKING AT GAY PORN
YOUR CHILD IS LOOKING AT GAY PORN"
And if they got slow internet, it takes them like 10 minutes to close it
I got my friend grounded for like 2 months