I was under the impression if I kept one hand one the inside of my computer I was grounded..... Myth or fact?
Some people say that having psychiatric problems means you don't have both feet on the ground... but I reckon if you have both feet touching the floor you're grounded.
Donning a pair of those thigh high rubber boots that fishermen wear might help... especially if you've had a plumbing mishap.
I suppose keeping just one foot on the floor would men you're partially grounded, but if that were me I'd take the extra precaution of wearing a pair of rubber surgical gloves, t' be shure, t' be shure.
Seriously, as Doc advises, the safest was to avoid static damage to your PC is to wear an anti-static wristband. In other words, I wouldn't take what it said on your graphics card packaging as being gospel if I were you.