Drink or avoid drink.
Inhale deeply or take shallow breaths.
Listen to death metal quietly or classical string quartets at full volume.
Brush your teeth twice a day or every other day.
Call friends who live far away and lay a guilt trip on them or give chocolates to the neighbour who annoys you most.
Re-read a book you read last year, but in reverse.
Heckle passers-by from your window informing them they are wearing their masks incorrectly.
Control your dreams.
Measure the doppler effect of an ambulance's siren as it approaches you, then as it goes away. Code an app based on that data.
Submit a post on GeoExpat under a friend's account that might embarrass him. Then edit it.
Resign from a job you don't hold via fax.