not really, look for results of other clubs and enjoy watching Barcelona, but don't come close to supporting anyone else, except the team that is playing Man Utd! - reminds of something funny I heard at football last week - some little 5 year old kid was going round telling people that his dad supports 2 teams, Spurs and whoever is playing Arsenal, found it quite amusing.
I started following Real when Macca went there as he has always been my favorite player, but not so much anymore. Watford are the only other team I care about. My uncle used to take me every week and I never saw them lose live. I started when they were in division two and they won that by a mile. It was a bit harder to see them in Division 1, but they got to the playoffs and won. And all of a sudden, everyone in Watford cares about the team as soon as they made it to the EPL and I could barely go. And look what happened.