how was my day at work? / I should have just punched myself in the balls, repeatedly of course!
A Sad Trooper meme.
Sad Trooper is a Star Wars stormtrooper in a dejected pose, the anonymous soldier of the Empire having a bad day. Captions describe the lonely, unlucky or thankless side of life - missing every shot, being sent on yet another pointless mission. It's the meme for melancholy with a helmet on.