Dressing like an old man
This man’s girlfriend had one huge complaint about him: he dressed up like an old man. Even though we don’t have a keen eye for fashion, she did have a point. There’s no problem if you don’t dress your age since you’re free to put on whatever you want. However, he didn’t think anything was wrong with his wardrobe.
Until he ran into his future-self in a public restroom. Behind him and to the side, you can see an elderly man wearing the exact same outfit as he was. If he thought his girlfriend was talking nonsense about his old-fashioned choice of apparel, this definitely changed his mind.