The sure-fire way to solve life's awkward problems:

Give a thumbs up.

Before:
Movie ticket guy: Enjoy your movie.
You: You too.
Movie ticket guy: (Not another one.)
You: (Crap.)

After:
Ticket guy: Enjoy your movie.
You: *thumbs up*

---

Before:
Person: And thib wish ejadnvfba eijad.
You: What?
Person: And thib wush ogakda jdajwi.
You: *blinks*
Person: And thuab waudh doaje iadjjie!
You: *nods slowly* (I have no clue what they're saying.)
Person: (They have no clue what I'm saying.)

After:
Person: And thib wish ejadnvfba eijad.
You: *thumbs up*

If this was a product, I'd be a millionaire.