How my GF almost cracked my nuts into oblivion

Days ago she tried to scare me jumping at me like a jumpscare, and I acted cool but kinda did sh1t on my pants.

Today It was late on the night when I spotted the perfect opportunity: she was drawing, only lit by a certainly weak, warm lightbulb and listening to "Dark is the night" playing on her cellphone. I hid behind a wall and waited, and after a few minutes she got to her feet to walk, I assume, to the couch, so I took advantage of the opportunity and feigned throwing myself upon her, lightly touching her face.

She yelled... loud, so loud It woke everyone in the house. I was about to start laughing when she closed her fist and slammed it right on my crotch.

Unfortunately the male instinct of self-preservation kicked in and I covered my jewels, so she just hit my hands; however I still felt it like someone had shot a cannonball between my legs, she's not a particularly physically strong person and still somehow managed to literally dislocate one of my fingers and make the momentum mangle my balls to the point I had to take a moment to breathe normally again.

Now I'm in my bed, everything's right, I'm just wondering what would've happened if my subconscious hadn't made me raise my hands to shelter my future children, and I had taken that fist no protection at all...

Maybe I'll try scaring her more often.