Ok, as promised, here's a thread of my top 15 non-verbal gestures for effective behaviour management:

1. A much neglected oldie, best used when only one or two pupils are still talking:

2. Wiggle that earlobe when you see a rogue off-tasker:

3. A gentle side to side headshake, which says "don't even think about doing what you're thinking of doing":

4. This is more forceful and vigorous than no. 3. It says immediately desist: