I've got Iowa +19.5 and the over. If we lose by more than 19 it's going to be a high scoring game and I pay the juice. If we lose by less than 20 then it should be low scoring and I pay the juice. Worst case is we get blown out and score less than 50 pts. In that scenario I lose both but I don't see that happening. I would probably weight this bet as this:
30% chance of winning both sides
65% chance of splitting
5% chance of losing both sides
well, your 5% chance just hit.
Who saw that coming? Holy crap we scored a whopping 40 points.