Two chemists walk into a bar . . .
The first chemist asks for H2O. The second chemist says, "I will have some H2O, too." Then the second chemist says, "Ah the hell with it I'll have some C2H6O instead." Then the first chemist realizing he had failed to poison his nemisis says, "YOLO, I'll have some C2H6O, too." The second chemist waits a week and then marries the first chemist's wife.