Scariest Bathroom Experience Ever.

So I'm at my dad's office, as I often am after class, and I realize I need to use the washroom.
I proceed to the washroom, choose a stall, and go in to use it.
No sooner than I sit down do I hear someone stomping in. She bulldozes into the stall directly next to mine and slams her stall door so hard that mine jars open.
Needless to say, I was too scared to pee.
I waited for about 40 seconds, and she stormed back out.
Terrifying.