1) City Matches
2) New Orleans Saints Matches
3) Premier League/Champions League/World Cup/FA Cup/League Cup Final
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4) NFL Playoffs (Including SB)
5) Olympics
6) NBA Playoffs
I watch a lot more stuff but those are the ones I wouldn't miss regardless.
The top 3 I wouldn't miss at all, along with the Superbowl (although I won't be able to watch that tainted thing this year), the Olympics I watch as much of and the NBA playoffs I usually bandwagon and watch the best team (if I'm staying up until that time I want to be entertained). The top 2 ruin my day/week/month/year if the result goes the wrong way.
Some Premier League Matches would go to 1.5, i.e wanting Liverpool to lose but tht varies season upon season depending on our rivals.