I guess you got an under 69 somewhere? I took under 68.5 at -115 to win a dime. Could afford to have 8 points score in the final 63 seconds and still win, usually a very safe margin in a blowout. Instead, 9 points score, the final one after an absolutely meaningless foul with under 35 to go, and the first one where the dude was shooting the bonus. He missed the front end and hit the second. Loser!
Had a similar situation last Saturday, also for a dime on the under in a Utah NBA game. The Jazz were up by a million and got possession with around 10 secs left. Trying to free themselves from the press, they pass down to Okur or Kirilenko who dunks it with like 3 seconds left instead of dribbling it out. Happened in Northern Iowa v. Georgetown in round 1 of the NCAA too...a dunk with a few ticks left in a game that had been decided. And got a push on another under meaningless 3 hit with seconds left in an NIT game a couple weeks ago.
Seems to keep happening. Very agonizing.