Shirley's Believe It Or Not

I was at a friend's place for cg last night when i noticed something i haven't seen eversince i came here. A WEIGHING SCALE! i stood on it expecting that i either remained the same weight as before i came or perhaps lighter....but to my surprise, I'VE GAINED 7 Kg!!! This is impossible! I haven't gain weight in years. The scale wasn't faulty because my friend also weighed and it was his normal weight. Do I look like i've gained 7 kg? I still look as thin as ever. The extra weight obviously wasn't fats...muscles perhaps? lol...