At best friend's house for a party several years ago. Pretty much open to whoever. Mutual friends with twins who ask if a co-worker can come over. Sure. And what about his younger brother who is joining the Navy on Monday? Sure. Younger brother has had trouble in the past and has joined the navy to clean up and get straight but this is his last big outing. Older brother is cool but younger brother is a douche but everyone puts up with him because he's about to ship off for training. After insulting everyone the younger brother disappears into the well-to-do residential neighborhood at like 5am. Older, responsible brother goes to find him. Twenty minutes later we hear a large crash a block away where there was a sharp turn in the road. We all go running to the accident. Both brothers in the vehicle. Neither wearing seat belts. Both unresponsive (younger convulsing and older clearly gone already). Cops show up. On a side note one cop who shows up asks another mutual friend/drunken party goer to back his squad car up to make room for the approaching ambulance. To reiterate - cop orders drunk guy to drive his squad car which he does. Ordinarily it would be kind of cool to say you've driven a cop car drunk (as ordered). But the circumstances of the story are not a story you'd want to tell again for laughs. Lots of paperwork to follow for two guys none of us knew before the night began. You could make the bad joke "Damn John, you sure threw a killer party last night!" but it's clearly too soon and too tasteless.

tl;dr Friend throws party. Two brothers show up - one responsible and one douche who's about to clean his life up. Both wind up dead after a high-speed crash. Also - Cop tells another drunk party-goer to drive his car.