Uncle told me this joke when I was 7

While staying in an unfamiliar town, A guy goes into a dingy bar and starts knocking a few down. After a couple of hours and many drinks, he notices a huge jar on a shelf behind the bar full of $50 notes. He calls the bartender over and asks "Wtf is that jar full of $50 for?". The bartender moves the jar onto the bar and says "You put $50 in the jar. If you can complete 3 tasks the jar is yours"
Never one to refuse a challenge, the man pulls $50 from his wallet and drops it in the jar. "Okay" says the bartender as he grabs a bottle of rum, "The first task is to drink this entire bottle within 10 minutes". The man struggles but gets the whole bottle down with time to spare. "What's next?" he slurs, clearly extremely drunk. "There is a dog chained up out back, he has a rotten tooth that needs pulling, and he is one mean mother-fucker. When you're done with that the third task is waiting for you upstairs, see my grandmother lives up there. She is 95 years old and hasn't had sex in a long time, so once you fuck her the prize is yours".
The man stumbles out the back and a few moments later the bartender hears the dog beginning to yelp in pain. 10 minutes later the man walks back in to the bar with a triumphant look on his face and yells "DONE! OK NOW WHERE IS THIS OLD LADY WITH A TOOTHACHE"