mugglebornheadcanon:

200. Muggleborns singing pop songs in the common room and then everyone joins in. The purebloods get startled when they hear a quiet “I knew you were trouble when you walked in…” one moment, and then the next they’re blasted with “NOW I’M LYIN’ ON THE COLD HARD GROUND!”, and then something that sounds like mass screaming. One of the more sensitive students actually calls for a prefect.