When someone is sleeping change their clock time and wake them up late for school/work.

Go to a restaurant and every time the waiter comes by change your accent.

If you have the type of light switches where you can change how bright they are, make them darker as slow as you can while people are in the room and see if they notice. XD

When ever there's a sub teacher, change your accent.

At a clothes store(where there is a lot of people) start talking to the mannequin like it's your mom then when they look away change it with a person that looks like the mannequin and when they say that the mannequin is not alive have the mannequin say don't talk to my child like that(see ho

Every time you meet someone new, change your name.

Get your friends phone and change all their contacts names to Star Wars/ Something Funny.

Take one of your friends phone and change all the contacts to State Farm.

The next time a friend leaves their phone with you, take a ton of selfies and change their wallpaper to the best one.

Go to your search settings and change the language.

Have a better idea for this list? Send it on in!