i got some ideas from ms.sue (thank-you)

How about --
a kid who boasts that his big brother can beat up another kid's big brother?
or --
a person who shoplifts a candy bar and is then accused of shoplifting much more?
or --
a girl who boasts about her "hot" boyfriend?

but i don't get how to make them get into amusing troubles

In the first scenario, suppose the other kid's brother is a huge wrestler? How does the kid get out of this predicament?

In the second scenario, how does the kid convince the security personnel that he didn't steal anything else?

Use your imagination!

To make these ideas more amusing, you can add elements of irony, unexpected twists, or exaggerated consequences. Here are some suggestions on how to develop each idea into an amusing trouble scenario:

1. Kid boasting about his big brother:
- The other kid challenges him to prove it by setting up a competition, involving silly tasks like an eating contest or a ridiculous race.
- Both kids' big brothers get involved and end up competing in embarrassingly funny situations, like a dance-off or a pie-throwing contest.
- Ultimately, the boasting kid's big brother loses, and the boasting kid learns a valuable lesson about humility.

2. Person accused of shoplifting a candy bar:
- The person is mistaken for someone else who committed an elaborate jewelry heist and is pursued by comically inept detectives.
- The person's attempts to clear their name lead to even more absurd misunderstandings, such as being mistaken for a secret agent or becoming the target of a quirky gang of thieves.
- In the end, it is revealed that the candy bar was slipped into their pocket as a prank, and the real shoplifter is apprehended.

3. Girl boasting about her "hot" boyfriend:
- It turns out that her boyfriend is actually an amateur magician who constantly embarrasses her with his failed tricks. She tries to keep up the image but ends up being the target of numerous comedic mishaps during his performances.
- A new student arrives who is genuinely attractive, and the girl's efforts to prove her boyfriend's superiority lead to a series of hilarious situations involving mistaken identities and misconceptions.
- Eventually, the girl realizes that looks aren't everything, and she appreciates her boyfriend's true qualities, which are his sense of humor and kindness.

Remember, the key to making these situations amusing is to introduce unexpected and humorous twists, build up tension through misunderstandings or exaggerations, and allow the characters to learn important lessons along the way.