I know what you're thinking.. there are so many!
Here are some of my favourites:
The labelling of Ibrox as Castle Grayskull - this is of course actually a compliment since this is home of he-man, a place of good which was always under attack from the forces of evil.. quite a fitting name!
There was of course the amusing 'Of the blueroom is bare' song, to try and slag Rangers for not having any trophies, again pretty ridiculous considering trophies are not kept in the blue room.. they are kept in the trophy room.
Another failure is calling us The Rangers, when the fact is that this is nothing new. The company was always The Rangers Football Club PLC.