Foot squek
I used to support a user who operated the mouse with their right foot.
Remote support worked well enough as he'd not changed the settings.
However a hot summer forced him to change to the more traditional mouse method, but he span the mouse round and used him palm to click. That was an interesting remote support session for the first 30 seconds or so whilst he explained this, and helpfully put the settings for me back to 'foot' mode.
And he wasn't doing any of this to deliberately wind me up either. Nice bloke. Smelly feet though.