Blonde went into a hardware store and asked the assistant "What are those up there?" The assistant replied "They're Thermos flasks." The blonde asked what they were for and was told that "They keep hot things hot and cold things cold." "Great" she replied "I'll take one." Next day the blonde showed the thermos to her friend who enquired as to what it was and what it did.

She informed her friend what the shop assistant had told her.

"Great" replied her friend "What have you got in it?" The blonde told her "Two cups of coffee and an ice cream."