A man in a bar is annoyed by the behavior of some other guests, who have had too much to drink already. One man asks him: Hey man, what do you do for a living? I am an inventor, he answers. O, yeah, what did you invent, man? I invented the time machine.
Now many visitors of the bar start t laugh.There is no such thing as a time machine, they say.
O, yeah, I'll show you, just follow me. The man leaves the bar in the company of many others. They go to an old building that is used by the Salvation Army. Here it is, the man says, just look inside. Te others look through the window. I don't see a time machine, there is just some old drifters, sleeping on dirty beds, one man says.
Look again, the inventor replies, you are now looking into the future. This is what your future will be, if you continue drinking the way you do now.