✔ Make fun of (or poke fun at) - to make jokes about someone or something in an unkind way.
➡ Example - The other children made fun of her because she was always so serious.
✔ Prankster (noun) - someone who plays tricks on other people.
➡ Example - You weren't the first prankster to destroy the car I rent from mum, and you won't be the last.
✔ A figure of fun - someone who is laughed at by other people.
➡ Example - I wish the little Irish girl wouldn't make us figures of fun, said Ben, speaking in an annoyed tone.
✔ Laughing stock - someone or something that everyone thinks is very silly.
➡ Example - Another performance like that and this team will be the laughing stock of the league.
✔ For a laugh - If you do something for a laugh, you do it for enjoyment.
➡ Example - Just for a laugh, I pretended that I'd forgotten it was his birthday.
✔ Make a monkey out of someone - to make someone seem stupid.
➡ Example - I'm not going to dance too much at the party because I don't want to make a monkey out of myself in front of my coworkers.
✔ Laugh someone/something out of court (informal) - if you laugh someone or something out of court, you show them that you think their ideas or suggestions are very silly.
➡ Example - When she suggested trying the new treatment, they laughed her out of court.
✔ Pulling someone's leg - teasing (making fun of) somebody.
➡ Example - Stop pulling my leg. I know you’re only kidding!