Blown out knees always happen on the last run of the day. This makes sense, after all, it's not like you were going to ride the lift up and take another run after hurting your knee. Of course when people say, "It happened on the last run of the day," we know they meant that it was going to be the last run of their day regardless of whether they blew out their knee, but we also know that it happening on 'the last run' adds extra tragedy to their story. You know when else blown out knees happen? When you take a winter off work or school to ski. And in those cases, they happen on the first Halloween you've gone skiing in years. The best skiers don't blow out their knees when they launch huge cliffs or try something new in the park, no, it happens to them when they fall down in the lift line. Usually they're trying to avoid a snowball that a teenager threw at them from the parking lot but don't get out of the way quick enough. Whenever I take my last run of the day, I try to say, "Okay, last run coming up. No blown out knees so far." I figure it's such an outrageous jinx that I'll never actually get hurt on that last run.