Slightly off-topic I know, but perhaps the stupidest thing he has ever said was, on Soccer Saturday I believe:
"No chance, if they win that game I'll eat your hat".
Now, I'm far from being an expert in old sayings (or hat eating), but I'm pretty sure you're supposed to eat your own hat in that scenario. If you lose the bet, and have to eat your hat, the bet 'winner' gets to watch what I expect would be quite a humorous spectacle. If however the loser ate the winner's hat, that humorous spectacle would presumably be significantly tempered for the winner by them having to sacrifice their own hat, which would seem very unfair given that they won the bet.
So anyway yes Merson is a complete moron.
P.S. RE: the game, United have been far worse than us recently in terms of the football - I'll be a bit disappointed if we don't edge it, though of course anything can happen in a single game so won't be remotely surprised if we lose. Would probably reluctantly take a point. Head says we win 2-1, heart says 1-1, bookies say they are marginal favourites, so fuck knows.