If you ask us what the best and the worst activities in the world are, we would say it's pranking other people and being pranked! And it tastes even better when some famous people are a part of this chaos which makes the joke truly hilarious. So if your Monday doesn't differ greatly from the Mondays we've always hated, we are happy to introduce you to 9 best hidden camera pranks showing Adele, Daniele Radcliffe and other celebrities testing their sense of humour on simple strangers. Enjoy!