What are really funny but random things to do it public while out with friends age 14 onward?

Go on a mannequin challenge spree: Choose a public place with plenty of them, like a shopping mall or a department store. Suddenly freeze and pose dramatically. When people walk by, keep your pose until they've passed. Then, burst into laughter and explain it was a Mannequin Challenge.

Have an impromptu dance party: Find a catchy tune playing in a public space and start dancing your heart out. Encourage your friends to join in, and watch as bemused passersby can't help but smile.

Hold a "sign war": Bring a bunch of poster boards and markers, and take turns writing funny and witty signs. Hold them up in public places and see how many people stop to read them.

Play a game of "Would You Rather?": Take turns asking each other crazy and hilarious hypothetical scenarios. For example, "Would you rather eat a live spider or jump out of a plane?" The more absurd, the better.

Engage in a fake argument: Pretend to have a heated disagreement in public about something trivial. Make it over-the-top and theatrical. Watch as bewildered bystanders try to make sense of the situation.

Conduct impromptu interviews: Assume the role of a journalist and start interviewing random people on the street. Ask them absurd and unexpected questions, and capture their baffled reactions on camera.

Create a human traffic jam: Stand in the middle of a busy sidewalk, holding hands with your friends. Create a "roadblock" and have fun watching the confused reactions of those trying to get through.

Organize a "flash mob": Choose a public place and gather your friends. Rehearse a simple choreography and then suddenly surprise everyone with a synchronized dance performance.

Have a "silent disco": Wear wireless headphones synced to your music player. Dance and groove without making noise, while others wonder why you're enjoying silent music.