I don't think so. It's a thing with tube amps especially, that right after you turn it off, the powercord can contain some nice snap if you touch it right away.
With my vox amplifier I have this thing for it, it's so wierd. I always touch the powerchord to "check" if I get a ZAPP or not. I never do and I go "phew" every time.
Living on the edge you know? I love living on the edge, you know like throwing snowballs at old ladies going
"I hope i don't hit her *hu,UH!".... 'phassshhhhhhWOOOM right by her side *PHEW!"
"buying two sodas at the shop instead of one, 'I might not drink it', you get home, watch some tv, drink one soda, you look at the other one,
'Oh I'm gonna drink you, oh yes I am, LIVING ON THE EEEEDGE!!!'
Then all of a sudden you've had two sodas looking around you to see if anyone catched it,
"I'm on fiiiire tonight!!! Did you see that?? I've had twooo sodas, yeah baby! LIVING ON THE EDGE!!!"
you know?