Pulling faces at people talking with food in their mouths has given me a lot of success. Saying “Urgh” is a sarcastic, but friendly manner has often worked a treat. It also calms me down a little, somehow!
A long and sustained “BBBBBBBBOOOOOOOOOOOOOO” at people tapping or clicking pens has done wonders for me.
It still bemuses me why people are so oblivious and ignorant with how I react.