The catch signal can get you into trouble. If you use it on a low pass and the official on the other side saw the ball on the ground!
I did use the booble one time. Two good teams , close game in the 4th quarter, energy level of players coaches and fans very high, pass on my sideline, home receiver on home side, back to sideline, boobles pass, steps out then secures ball in his hands. I gave incomplete then stop the clock. I paused looked at the coach and gave mild booble signal, then incomlete pass again. It defussed everything including the fans. Some other officials saw the game on TV and asked me about it. They agreed that it was good in that situation due to the excitement/pressure. It was a single officials call, no chance that another official would be helping me by seeing something different.
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