Marijuana, the most often used illegal drug in this country, is a product of the hemp plant, Cannabis sativa. The main active chemical in marijuana, also present in other forms of cannabis, is THC (delta-9-tetrahydrocannabinol). Of the roughly 400 chemicals found in the cannabis plant, THC affects the brain the most.
Cats 'vibrate' when marking territory-spayed cats can also 'dry' spray. Spayed male cats urine doesn't smell. They swish their tales as a sign of annoyance or anger. If the tip of the tail 'trembles', it's quite often a sign of being 'unsure' about something. Source(s): Cat owner.
Not to be confused with Shake Ya Tailfeather.  Shake a Tail Feather  (Otha Hayes, Verlie Rice, and Andre Williams) is a song originally recorded in 1963 by the Chicago-based group The Five Du-Tones. (This version was featured on the soundtrack of the 1988 film Hairspray).