Here’s a weird video of a guy who shares his creative thoughts on some gestures. It is difficult to decide whether he’s irritating, funny or just fooling around.
In any case he nicely demonstrates the funny stuff that can happen to gestures. He invents a ‘weird’ gesture or at least seeks world-wide acceptance of it (check alternatives). He also adjusts the form of ‘ssshh, quiet’ and several others. And in-between he provides a constant stream of co-speech gestures. There is a self-destructive threat and some obscenities (reminding me of Matthew Richardson) near the end which are… eh, interesting… but I definitely like his scary dinosaur best of all.