The Worst Error You've ever made reffing a game?

[SWMOzebra]

BV game in late February a couple of years ago, working two-person with an experienced partner. SRO in the gym, officials' locker room is behind home bench. Home team played a terrible first half and was down 14 when Q3 started. The second half was fast and furious, few fouls called as the boys were playing fairly clean. My P and I were mostly trying to stay out of the way.

16 seconds left in the game, home team scores to tie the ball game. I am old L becoming new T opposite the table, there is no backcourt pressure. I'm trailing the player about 4 steps and probably about 3 steps to his right, he is dribbling with his left hand. I can see the defense set up in a 3-2, I can see the V bench if the coach decides to call a TO, I felt like I was in the perfect position.

Just as he crosses the half court line, I see the back of his right arm move oddly (remember, I'm trailing). Of course, my first thought is "he just double-dribbled" but since I didn't actually see it, I don't blow my whistle. However, I'm about the only one in this small gym who DOESN'T see the double-dribble. Home coach is screaming, fans are screaming ... visitor coach is shouting at his player to hold the ball at about the 8 second mark. Home team stops playing defense out of frustration with my no-call and thinking game will go to OT. Ball handler makes a quick bounce pass into the post and the receiver spins, putting the ball in the hole. Then the horn sounds.