Me too, I know right away the SECOND I wrap my hands around the neck.I find that it really cheers up the staff, and upsets the muppets when I wander in play something for less than a minute, or don't actually play it properly, just run my hands up and down the neck a bit, and check it makes a pleasing noise and say either yay or nay almost immediately, hand over the cash (or not) and saunter out with (or without) my new toy. Speed is important, if you don't like it straight away, don't bother.
But as for the 'CHOKE' wha' da hell does I plays? thing I think it happens to everyone. Guitard wankers are pretty a dime a dozen and are always showing off, whether they can or not, but we bassists are far more grounded, and have no need to 'wank' to a bunch of wannabe's.
I also find the same effect in a record store. When I'm on my way I've a list a mile long running through my head, when I get there I'm lucky to remember my name