[Electronic M]

B+ shocks are fairly easy to avoid if no part of your body is touching anything grounded. If no part of your body is touching anything grounded or electrical and you grab B+ you won't be harmed or even feel it....you are essentially (as linemen call it) a bird on a wire. Birds land on energized power lines carrying several KV and are not harmed by it because they are not touching anything else at a different voltage thus no current is flowing through them.
When doing live underchassis work like voltage measurements or alignment I try to keep one hand in my pocket and avoid touching grounds. That way if I touch B+ I'll do it in bird on a wire mode and not be harmed.

Another practical example of this is something that happened to me as a teenager. I was steaming off the wallpaper in the kitchen of my parents last house close to a switch plate an standing barefoot on the brick floor of the slab the house was built on (in short I was standing barefoot on earth ground) touching the wall anywhere within 1' of the plate I got a pretty good electrical tingle. I mentioned this to my dad who was wearing rubber shoes and he came over, touched the wall and couldn't feel it and was wondering if I had lost it.... After a moment of wondering WHY he couldn't feel it I told him to take off his shoes and touch the wall. THEN HE FELT THE IT!