You are. I mean..you've got to be. Otherwise you just deliberately plow on repeating someone elses joke. I think you, being North American, are oblivious to subtle humour.
I'm not above self deprecating humour now & again you see. Obviously knowledge of this seems to constantly pass you by as you've done this before.
In summary, I already made the joke you ploughed on with. Next time I'll put up sign posts so ya don't get yerself good and lost again.