The diving, cheating, spitting, swearing, constant challenges of authority, inane drivel from commentators, Maaaaaark Lawrenson in general, these are nothing compared to a ten second countdown.
I have often watched games from behind "enemy lines" and, while wanting to cheer my little cotton socks off, have utilised polite applause instead. In fact I would recommend it as the only option in those cases. ;-)
A Rangers fan at Easter Road or Tannadice would be foolhardy indeed to cheer. I like my delicate bits where they are; they might not be very impressive, but they're dear to me.