A grasshopper comes into the bar, and the bar tender says "Hey, I've got a cocktail named after you" The grasshopper says, amazed "What, Nigel!"
Just to explain for all the people who don't get the joke! (I have to explain it to about half the people I tell it to. Such a shame!)
A typical grasshopper cocktail consists of equal parts green Crème de menthe, white Crème de cacao and fresh cream, shaken with ice and strained into a chilled cocktail glass.[2]