Can you?

An old man was sitting outside on his porch enjoying the last moments of summer. He was smoking a cigar and drinking a glass of whiskey. His grandson wandered outside and saw him out relaxing by himself.

The young boy asked, "Hey Grandpa, may I try your cigar?"

His grandfather looked up and asked, "Well, are you old enough?"

The grandson wondered out loud, "How do I know if I'm old enough?"

His grandfather asked, "Well, can you pull your wiener down so it touches your bum?"

The young boy, confused, said no...

His grandfather replied, "Well, you're just not old enough, bud".

Frustrated, the kid spun around and stomped inside. A couple minutes later, the determined boy wandered outside again and asked his grandfather...

"Hey Grandpa, may I at least try some of your whiskey?"

The grandfather replied, "Well, are you old enough?"

The grandson asked, "How do I know if I'm old enough?"

The grandfather replied, "Well, can you pull your wiener down so it touches your bum?"

The frustrated boy yelled no, then turned inside.

A couple minutes later the boy walked outside again, but this time with a cookie in hand.

Seeing this, his grandfather asked, "Hey bud, could your grandfather get some of that cookie?"

The boy looked up and asked, "Well, can you pull your wiener down so it touches your bum?"

Excited, the grandfather perked up and said "Yeah, I can do that."

The boy took a bite of the cookie and said, "Well, you can go fuck yourself."