Better dead than drunk

"I'd like to buy a bottle of Vodka,please", asked Tommy.
"Sorry son", said the liquor store owner, "But you're only 18 and I can't sell alcohol to anyone under 21".
Just then however, Tommy had an idea and went next door to the gun store.
"I'm 18 years old and I'd like to buy a gun and bullets", he said.
"Thats perfectly alright", said the gunstore owner with a smile, "You're old enough to buy a gun".
In only a matter of minutes, Tommy had bought the gun and, after loading it,went back into the liquor store and pointed it at the owner.
"I'd like to buy a bottle of vodka,please", he said.