Too much information

If only I’d forgotten the punchline…
“The first time I met my g/f’s parents, we
had a cracking piss up, got absolutely ratted
then started telling jokes. They were getting
progressively nearer the knuckle so I thought
it safe to tell her Dad my favourite (”Did
you hear the one about the SS Commandant?”
then as they say “no” you slap them around
the head and shout “LIAR” in your best Jerry
accent). Firstly I knocked her Dad off his
seat, secondly I had completely forgotten
that they were Jewish. I’ve not been invited
round since.”

thanks to Seb for forwaring this one.