This solution is cheap and convenient; it's called a thermos.
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This guy from Arkansas gets a job on a construction crew. His first day at work and they break for lunch. He sees a guy pouring some coffee. "Hey, what is that?", says the Arkansawyer.
"It's a Thermos.", says the co-worker.
"What's that?"
"Well, it keeps hot things hot and cold things cold."
"Where can you get one?"
"Any hardware store or Wal-Mart."
The Arkansawyer shows up with his very own Thermos the next day.
The co-worker says, "Hey, you got a Thermos! What'd you put in it?"
"Two popsicles and a cup of coffee."
The scene: a sex shop.
The manager goes out to run an errand and leaves his assistant in charge.
A white woman walks in. "How much for the white dildo?"
"Five dollars."
A black woman walks in. "How much for the black dildo?"
"Five dollars."
A woman from Arkansas walks in. "How much for the plaid dildo?"
"Twenty-five bucks."
The manager returns and asks, "Well, how'd it go?"
"I sold two dildoes and some gal from Arkansas bought your Thermos for twenty-five bucks."