Star Trek: Deep Space Nine1993

[Rom reveals that he found out about Quark smuggling kemocite]

Quark:
What tipped you off?

Rom:
When I engaged the impulse engines, I noticed the ship's weight distribution was a little off. So the last time you went to waste extraction, I snuck back to the cargo bay and took a look around.

Quark:
Where did you get to be so smart?

Rom:
I've always been smart, brother; I've just lacked self-confidence. Of course... I could forget everything I saw.

Quark:
How much?

Rom:
Twenty percent of the profits.

Quark:
[to Nog] I suppose you'll want a cut too?

Nog:
As a Starfleet cadet it's my duty to report any violation of Federation law to my superiors immediately. But then again, I haven't been sworn in yet. I'll take ten percent!