A group of locals were gathered at the local watering hole, drinking beer and bullsh--g the usual stuff, while One-eyed Leroy, the stocker/sweeper/cleaner etc. was standing behind them leaning on his broom listening to the brilliant discourse:
"Yo, Sammy! What d'ya think is the greatest invention of the last century?"
"The airplane of course. It changed everything in regards to global travel." Says Sam.
"Gotta disagree with ya, Sammy. It was the automobile that got everything changed for the better."
The two went back and forth for a while, and suddenly Leroy (previously mentioned) interrupted them abruptly,stating "Excuse me, but y'all don't know what you're talking about. Those things don't even compare to the best invention ever - the thermos."
"What the hell is so great about the thermos?" asks Sammy.
Leroy relies, "Why it keeps my coffee hot in the winter, and it keeps my ice tea cold in the summer."
"So frickin' what", says Sammy.
Leroy looks at him funny, and says, "How do it know?"