“Sounds great. What's the catch?”
A person you know has offered to sell you her car for a very, very low price. You're excited, but you're suspicious about it because the deal is to good. You say this.
Sounds great. What's the catch?
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This is short for "That sounds great."
Say this when you want to agree with someone's suggestion.
What's the catch?
When you make deals with people, sometimes they try to leave a negative point until the end.
A: I think I found a job for you.
B: Oh really? That's great.
A: The catch is, it's in New Jersey.
When someone makes an offer that's "too good to be true", you can say "What's the catch?" suspiciously.