In the first house I grew up in next to the front door was a full length pane of bubbly glass. I don't know the technical term for it. You couldn't quite see through it, it was possible to make out vague shapes and colors to know something or someone was on the other side but it was completely distorted.
The doorbell rang one day and my brother and I, being fairly competitive, both took off running to answer get there first so we could answer it. I'm two years older and thought better of the situation about halfway there and stopped. Jeff kept going and probably lost traction on the tile floor, skidded up to the door and put an arm through that glass pane.
My parents were obviously very worried and went over to see how bad he was hurt, one of them opened the door to see who rang the doorbell in the first place.
It was a girl from the neighborhood (now I'm struggling to try to remember who, probably Jill or Carlie), in uniform, who said "Girl scout cookies?" with an utterly traumatized look on her face.