The weirdest call I ever saw:
Late in first quarter of HS varsity girls' game two years ago. Opponents substitute five players in and immediately go into a press. Quarter ends, and I tell my assistant to keep an eye on the scorer's table, then I tell my players if the starters come back in, we expect no press, and we'll do X. If they don't, expect a press, and we'll do Y.
Intermission ends, no one has gone to scorer's table, but the five starters come out onto the court. I'm not sure of the rule but I know that those players were supposed to report. I'm not sure if I should bring it to the officials' attention before or after the quarter begins. So right about the time the referee is handing the ball off for the throw-in to start the quarter, I start yelling that no one checked in, and that there are five different players on the floor. By the time anyone hears me, the ball is in and play has begun. The officials kill play and come to me to ask me what I'm saying, then to the scorer's table to verify that none of the opponents had checked in, then they huddle. The referee comes out of the huddle telling the scorer's table that we have five technical fouls.
I send my shooter up, who misses the first two. I'm thinking great, she's going to miss ten in a row. If she misses one more, I'm going to switch shooters. She makes the third, fourth, and fifth, and she isn't getting any more. I'm asking where my other five shots are and I'm told that "these kind of Ts are one shot Ts".