A bum walks into a bar and asks the bartender for a free drink. The barkeep tells the bum to hit the road. The bum eyes a spittoon and asks the bartender if he can have a free drink if he drinks the spittoon. The bartender laughs and says "sure", thinking of how much fun he'll have watching the bum drink all the spit and puke. The bum picks up the spittoon and starts to drink it. The bartender is repulsed and tells the bum to stop, he can have the free drink. The bum keeps drinking and drinking. The barman again tells the bum to stop in between his own wretching and dry heaving, but the bum keeps drinking. Finally the bum puts the spittoon down and wipes his mouth with his sleeve. The bartender asks why he didn't stop when he said he could have the free drink. The bum says " I couldn't, it was all in one string".
