It's Always Sunny in Philadelphia2005

Charlie Kelly:
[after informing a rival bar that the gang poisoned them 10 year ago to win a flip cup tournament] Check it out... Who's to say we didn't put that very same poison in the drinking water?

Mac:
[Customers begin spitting out water] Everybody relax. He's lying. He doesn't have any poison.

Charlie Kelly:
No, I don't have any on me. But, I do keep some in my fridge at home in the relish jar.

Frank Reynolds:
There's poison in that jar? I thought I was allergic to pickles. [pause] What's in the jar with the skull and crossbones?

Charlie Kelly:
Well, that's mayonnaise. That's a decoy.

Frank Reynolds:
And the mayo?

Charlie Kelly:
That's shampoo.

Frank Reynolds:
You're telling me I've been putting shampoo on my sandwiches?

Charlie Kelly:
If you're using the mayonnaise, yeah... probably.