power cord directionality

IF power cords do indeed have preferred directionality, and one is inadvertently flipped for a few hours, does it "harm"it?

Would not this equal to forcefully switch it's "gender"?

Was wondering...what will be this aft chuckle...
Did not have to wait long...

uhhh... duh end wif duh prongs on it gits plugt innuh wol. duh uther end innuh yer lektronix.  

how yu gonna ree vurs it?


didn't you miss few "mmm....like...mm...you know...mmm...like..."
by any chance?

I will say a prayer tonight for all of you...