I call it the 'Filipina Grapevine'
It's like that game we used to play as kids, you start with a sentence, and buy the time it reaches kid no.8 it has a totally different meaning
A patient says: Doctor, last night I made a Freudian slip, I was having dinner with my mother-in-law and wanted to say: "Could you please pass the butter"¯ But instead I said: "You silly cow, you have completely ruined my life"