What are some good pranks to do on grandmas?

there’s always the classic salt in the sugar jar trick

Put a rubber band around the sink sprayer and as soon as she turns on the water she will get soaked lol

If she drives stick a note on her car saying that the neighbourhood have got together and decided enough was enough about her driving…she is so bad they are scared to leave the house when they see her jump in her car…so could she please beep her horn before she sets of so we know not to go out driving….?

..with some thought it can work.. if she drives? :)

reset all the clocks in her house… so she wakes up extra early

ceran wrap her car. or the inside of he toilet.. take the ceran wrap in the toilet so when she goes poo it will look like its floating in mid air haha.

lol …so true

lol i cant do the clock one because i live with her and it would effect the time i get up from school LMAO @ the toilet one she might get mad and make me clean it up but,its worth a try

lol thats a good one :)

really simple but extremely funny, i might do that

ew ya gross. But i think the salt.joke that blackwolf said is a good one lol

If your grandma likes cooking then go cut up tomatos or something and use ketchup and “ cut “ yourself,,, I tryed it , it worked

. Knock on her door dressed as the Grim Reaper. .

Introduce her to the internet, sit back and wait for the hilarious questions :D

lol she already knows about the internet …she goes on Facebook and everything and she like to play games on it lol but it would have been really funny if she didnt know :) (she always does ask me questions about computers in general,like if it doesnt work or something)

There is videos on youtube for pranks, like if she watches the whole movie, something pops out of no where and screams