Is it normal to find your father strapped under your bed violently and shaking it?

Well i woke up up this morning and i thought we were having an earthquake! Then i realised it was only my bed that was moving, i looked under it and saw father strapped up to the undercarriage with elastic bands and Llama phlegm! He was gyrating really fast, i asked what he was doing and he just looked at me, went red, and made a funny hissing sound, ripped off the bands and ran away! I wouldnt of minded but he left a trail of poo and spit! He has done this before but last time he was strapped under my car wearing only knickers! Why do you think he is doing this? Is he being over protective? sent