I once had a close friend point a .41 magnum at my chest and pull the trigger, then start grinning. Needless to say, I have not spoken to him in 15 years. Not funny.
Then there's the time my best friend came out to go do a little plinking dressed in BDU's that were too small for his son. I thought he was serious. Imagine a man wearing a bdu shirt with the buttons bulging and half his belly hanging out, the cuffs of his pants up to his knees, his fly unbuttoned, wearing shower sandals and a great big sombrero with holes in it, and a Savage bolt .22 over his shoulder. He mumbled something about clothes being in the wash. He let it go for a few minutes ( he enjoyed watching me trying to stay composed) and then went back in and changed, much to my relief. (Also the same guy who liked to dump a five gallon bucket of ice water over the shower curtain onto someone taking a shower).
I am with George Carlin, you can make jokes about anything as long as they are in context, and don't threaten anyone's safety.