As a roving IT guy, that's one of my rules. "Never piss off the receiptionist." Even better, always be cool to the receptionist, and make sure they get taken care of. Because they're the ones who will get stuff done for you.
The other rule? "Never piss off the security guards." That ain't worth it. Jump through their little hoops, and someday you won't have to... preferably when you're hauling a $5000 machine out the door for repairs.
I am the Doctor, and THIS... is my SPOON!