Possibly the worst thing if you ask me...
I'm with Mark on this, whilst jokes about sheds / womens clothing etc get laughs from people who get them, to the casual observer they look at best tinpot, or at worst embarrassing and insulting.
A scoreboard should be used for what its there for = giving scores, teams, substitutions and club announcements and match sponsorships, and not to poke fun at local rivals or publicise crass in-jokes.