From Reddit:

When I was 19 and home on leave, she picked a fight with me and eventually advanced on me, fists clenched, hissing that I "wasn't too big to spank". I looked her dead in the eye and said, "I've had special forces training, bitch. Just try it... I've been waiting for an excuse to kick your ass for years." She caved and hunched up her shoulders and stopped coming at me. It felt AWESOME.