Wanna trade?

This morning I was in luck and was able to buy two boxes of "Beer" cheap at the local offie.

I placed the boxes on the front seat and headed back home.

I stopped at a service station where a nice looking young lady in a short skirt was filling up her car at the next pump.

She glanced at the two boxes of beer in the car, bent over and leaned in my passenger window, and said in a sexy voice, "I'm a big believer in the barter system, handsome. Would you be interested in trading sex for some Beer ?"

I thought for a few seconds and asked,

Spoiler:

"What kind of Beer 'ya got?"