Two friends went to a strip club.
When they got inside, they noticed two seats conspicuously unoccupied in the front row. Seizing the opportunity, they took the seats.
As soon as the first dancer walked out, the guy directly behind them yelled, "Yeah baby! That's what I've been waiting for!"
One of the friends in the front row turned around and gave him a dirty look.
A few minutes into the show, the dancer did a move and snatched off her top, revealing two tassles. The guy behind our friend goes off again. "Yeah baby! Shake those things." The other friend turned around and said, "Hey buddy, calm down!"
After a few moments, the dancer did another move, and snatched off her dress, revealing a very thin G-string. Again the man behind our friend yelled out, "Oh baby! You're almost there!" The other friend again turned around and said, "Hey buddy, shut the hell up, will ya!"
A few minutes later, the dancer stretched out on the floor and snatched off both the pasties and the G-string, and the whole club went wild, except for the man behind our friend. Curious, the other friend turned around and asked, "Say buddy, where's your enthusiasm now"? The guy responded, "It's on your back, dude."
LOL - had to read the closing punchline twice to get it