they drew on his face
Put gum in his hair
Liam and Louis straightened his hair when he was sleeping
This was a Photoshop prank.
Zayn
do something funny
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pull a prank on him
Louis prank calls him all the time.
Cheat on them
You can view videos of the skirt pull prank and learn how to perform it from the videos at the YouTube website. Once on the website, type "Skirt pull prank" into the search field at the top of the page and press enter to bring up the information.
put there hand in warm water while they sleep! you'll have to try it to see what happens. or shaving gel on there hand and itch there nose.
you can go onto fakeharrypotter.com