what the most embarrassing thing that ever happen to your boyfriend or girlfriend when they where with u

What about She had early PMS while making Love !! ;-)

We were at a company picnic.
She was wearing a white dress made of thin material.
It suddenly started pouring.
We got soaked, and if people looked at her they could pretty much see everything.

I puked on my ex while I was really drunk. She also drag me all the way to my house up Hill.

She hated my guts and becomes a Lesbian.

I was in the supermarket. There was this young lady who was wearing the exact same sweater and had the exact same figure and hair cut as my wife, I carefully slid up behind her and lovingly cupped the cheeks of her bum and breathed into the back of her neck. The poor girl was snow white with shock when she turned around. She was even too shocked to slap me. I was beat red with embarrassment and shame. I made awkward apologetic overtures and backed away, and she just glared with her mouth open.

Hitting a car/accident