Ruzuzu, my version is similar: three strings walk into a bar, and the bartender tells the first, "Sorry, we don't serve strings here." The second one tries: "Look, fella, we're not looking to make trouble. We just want a drink and we'll leave." "Look, I told your friend, we don't serve strings," replies the bartender.
The second string returns to the booth and says, "Come on, guys, let's get outta here. That bartender's a jerk." "Wait, I have an idea," says the third string.
He stands up, loops himself up, frays his top end, and walks over to the bar. "All right, this is getting annoying," snaps the bartender. "I told your two friends that we don't serve strings. Now aren't you a string too?"
Possible, I'll take your money--I can act out this joke pretty well (especially the frayed part). :-)
So okay, these two ropes... no maybe they were strings... um... anyway, okay, so these two strings decide that they're reallllllly thirsty, and they find this bar, see, and the first one goes in to get some kind of drink, but the bartender says "Sorry, it's impossible for me to serve alcohol to anyone who doesn't have proper identification."
Oh. No. Wait. I think that's another joke.
Um.... Okay.... Oh! I know! I know! Okay. So the bartender says, "Sorry, I can't serve a drink to a silly string!"