Can you believe I didn't get that one when I first heard it on the radio and took me about ten minutes of repeating it to myself and saying that's just not funny until the penny dropped. Didn't help when I tried to relay it to friends and got it wrong as I unwittingly changed it to 'what does ET stand for?' ....
@paulaw hahaha I will admit I read it twice - lol - it is because the language doesn't match or go together - if that makes sense - but it made me giggle