Oooooooooo, this is reminding me of the old, old story about the 3 kinds of gin...Huh? Sure, oxy-, hydro-, nitro-.
The reply is quite rude, but most of you have heard it, I'm sure: mustard, custard, and you...you big $#!^
Sorry, I've just returned from a 5 day reunion, and all the old folks came up with all the old jokes.