Well, Ken, Schadenfreude or not, that one has me laughing out loud... not because of the flying in [I've heard that one], but the one-two timing punch of the "Germans don't do comedy. They do beer." Of course, as German beers that are available here, Becks Dark is my favourite, so that didn't hurt any, either
So, is this to say that Freud was a joke... one that came from the misfortunes of others? [We won't take that comment too far into literal land
~ the comment itself, or the overall of it, may already be an old joke
I forgot to comment that I liked the structure of Twain's comment.
Your first two, extreme [I agree] examples... and I finally got the knock-knock one... remind me of the one joke I've been able to remember since 7th grade ~ "Ask me if I'm a truck." "Okay. Are you a truck?" "No." I think that's in the Idiofreude category
My understanding on the decaffeinated gift is that arsenic is used in the processing. That may be an old wives' tale, of course, but I know that since hearing it, most times I've opted for the caffeine.
Now that I'm fully into the spirit of the joke style, I just reread and got the pub joke, too. Kind of a deadly form of humour, isn't it?
Thanks for your continued efforts in this, Ken