Evelyn: Charlie was a planned baby.
Alan: What was I?
Evelyn: Well, dear, you were a pitcher of margaritas and a gas station condom.
[later]
Alan: Who buys condoms at a gas station?
Alan: What was I?
Evelyn: Well, dear, you were a pitcher of margaritas and a gas station condom.
[later]
Alan: Who buys condoms at a gas station?
Evelyn : Charlie was a planned baby.
Alan : What was I?
Evelyn : Well, dear, you were a pitcher of margaritas and a gas station condom.
[later]
Alan : Who buys condoms at a gas station?
http://www.tv-quotes.com/shows/two-and-a-half-men/quote_12371.html