Here's a fun little sociology experiment to try:
First, move to a new city. Move, but remember to keep your professional and collegiate sports affiliations firmly rooted way back in the city where you were born and raised. For example, just hypothetically, imagine that you've moved from Cleveland to Chicago, but have chosen to remain a Browns fan.
Next, wait around for an athletic competition during which your "traditional" home team spars with your "new" home team. In our purely hypothetical example, the Browns would be playing the Bears.
On the date of this contest, venture out to some public place where you can watch the game. Be certain that this venue has many fans of the "new" home team and that they serve alcoholic beverages. For our example, let's chose a place at random: say, Buffalo Wild Wings in Woodridge. (hypothetically, you are visiting your friends in Lisle for the weekend and therefore have to find a place to watch the game in the suburbs, which explains why you are in Woodridge.)
Make sure also that you are 1) alone and 2) dressed in something silly. Perhaps some black pajama pants covered in jack-o-lanterns that you bought for $2 on clearance at Old Navy several years ago, and a black sweatshirt with a Latin phrase on it that roughly translates to "Always wear underwear".
Now, visibly and audibly cheer for your "traditional" home team. Carefully observe the reactions of the other (some slightly drunken) football fans surrounding you as you cheer, out loud, against their team. Be sure to note any change in their behavior if POSSIBLY your team starts to really pull away with the game during the last three minutes of play, or, hypothetically, scores two touchdowns in 38 seconds.
If anyone decides to try this experiment, I'd be very interested in hearing your results.