I just scared the POOP out of a co-worker. Probably literally.

[Uncommon Sense]

Short background;
Me and a fellow co-worker have a scary past together in which we will sometimes see the other coming down a hall or some such and duck behind something and then jump out at the last second and scare the crap out of the other one.
On a scale of 1-10, I believe I just gave her a 10 scare.
She was trying desperately to swipe her badge at the employee entrance to get the door to open. The card reader was not reading the badge, so she kept trying to swipe. I noticed this as I passed the door (she didn't see me), so I circled back to the door and waited in hiding. As soon as I heard the door release (click) I pounced.
I blasted open the door and screamed at the same time.
I can't even begin to describe the look of horror and shock on her face. Her eyes opened up wide, she grabbed her chest with her hands, and turned instatnly red. She then, of course, slugged me on the shoulder and started to say something except she couldn't talk....she was in shock. I let her pass into the building and then she kind of wandered around the entry way not really sure which way to go next (still confused and catching her breath).
This whole time I'm trying not to laugh too hard, yet sort of concerned about her mental state.
She gives me another look and says, "OOOOh, that was a good one," in a wavering voice. She circled around the entry way some more and then started to make her way to the time clock area to punch in, except to my surprise, she turned towards the womens room a few feet away and ducked in. I think she might have peed herself. Normally she'd have punched in and then went to her cubicle and then to the cafe and then maybe to the bathroom.
I waited outside to make sure she was OK and when she came back out (still beet red) she pointed her finger at me and said, "I WILL get you back for this," with half smile on her face of the embarrassed/still in shock type.
I haven't talked to her since then, it's been a couple hours now. I'm going to go over and see if she's alright, I might have scarred her for life.
I would have liked to have seen the ECG readings from that episode.

Anyone else have a similar story?