"Smile when you talk on the phone and you sound much happier than you really are."
"If you always forget if you have locked the door/closed the oven/charged your smartphone/... do something stupid after you did the thing you're about to forget. You won't remember the actual locking, but you'll remember the stupid thing, and then you'll know you did the thing. Stupid things include doing a little dance or pirouette, singing a small song (rickroll yourself!) or saying something really stupid like "I'd like to eat a towel right now!"."