smarty pants

someone who displays intelligence in an annoying way

Amy: Oh no. Here comes Mark, Mr. Smarty pants.
Becky: I’ll bet he’s going to tell us about how to fix my car.
Amy: I’m sure you’re right. He’s always shooting his mouth off about all the things he can do.

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debut

–noun
1. a first public appearance on a stage, on television, etc.
2. the first appearance of something, as a new product.
3. (of a young woman) a formal introduction and entrance into society, as at an annual ball.
4. the beginning of a profession, career, etc

-verb
to appear for the first time, as on the market

A new product will debut next month.

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practical joke

is a trick played on someone that is meant to be funny for people watching, though normally embarrassing for the person being tricked.

What would you do if someone called you saying they were Barack Obama? Florida Congresswoman Ileana Ros-Lehtinen got a call just like that the other day and like many people would, she assumed it was a radio station practical joke.

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