You really chose an appropriate name for your postings.

Damage "after the fact?"

Kick the sh_T out of the car....then photograph it.

Get hammered in a pub parking lot - photograph it - and attribute it the previous accident.

I - ALWAYS - (even with rentals) carry a cheap throw away camera - wrapped in newspaper, wrapped in a towel, in lower section of the boat...to help keep temperature stable....toss them away after two years or non-use. You can get them, with film for less than 3. Photograph the damage, and the skid marks, and the person and the other vehicle. Process IF necessary, otherwise refrigerate until needed.