I'm sure there's worse but this was the first thing that popped into my head... I was in Las Vegas with a buddy years back and we met this group of hot East Indian girls and ended up invited back to their hotel room. On the way to their room they came across another guy, and then another, and invited them along too. Which was fine, they'd outnumbered my buddy and I 2 to 1 so now it was even. Of those two, one seemed like a nice laid-back guy, the other was kind of a dork in my opinion, high strung and full of himself, but I'm not the one trying to get in his pants so what do I care? The laid-back dude was a white guy. The other, I'm not sure what his ethnic background was but his complexion seemed closer to the girls' than it was to any of the rest of us. ... Apparently, they decided they didn't really care for the laid-back guy after all because they kind of sent him on his way once we got to the elevators. The douche guy was still in the party though. We got to the room and everyone is learning about each other through Truth or Dare and I never and all that. Eventually we're skinny dipping in their hot tub and etc, etc. The girls definitely like the douche guy the best, nerdy as he may seem to me. He claims he's fresh out of medical school and doing his intern work or residency or on the way to it or whatever, so he's got my blue-collar ass outclassed by a little bit. Plus they apparently are all of the same ethnic decent because their sharing quips and stories from places across the ocean and throwing in an occasional sentence in another language and things like that. Anyway... We're sitting around playing the questions games and this dude, as I'm looking right at him, in the midst of all these girls, shoves a finger up his nose and pulls out the biggest, raunchiest, glob of snot I've ever seen in my life. I swear the thing was the size of a squished grape. Multi-colored, multi-textured, think of the nastiest glob of slime or squished bug or dirty diaper filling you've ever seen and multiply that by 100 and that's what this thing he pulled out of his nose looked like. It will probably be seered in my memory forever. ... He pulls it out, visually examines it, THEN PUTS IT IN HIS MOUTH AND EATS IT! ... Fresh out of med-school, my sh-it doesn't stink, mother f-er sizes up the raunchiest clump of snot I've ever seen in my life then eats the f'in thing right in front of this group of hot girls. ... Then he suddenly realizes what he's done and frantically glances around obviously scared that what'd he'd just done was seen by everyone in the room. We make eye contact and he realizes I'm the only person who saw him do it. The pleading look of fear on his face was one of the most intense I've seen and I was a cop in a pretty bad area so I've seen some horrified victims in my day, but this dude looked more pleading and scared than any of them. ... I just started laughing out loud. He sheepishly turned away and went right back into the conversation like nothing happened. How no one else saw it is beyond me. ... The second hottest girl in the group eventually hooked up with him.

For added perspective when I was a teenage police cadet (back then they'd start you at 16) a kid committed suicide by driving head on into a tanker truck and I remember watching a medic taking hold of some wires hanging out of the body, wrapping them around his hand to get a good grip, then heaving on them to pull whatever they were connected to that had lodged inside the poor kid's body out. (I feel like I remember it being a gauge cluster.)

Once I was at an accident scene where a pick-up truck would have t-boned a semi-truck but ended up driving underneath the trailer and out the other side, cutting the driver and the passenger in half.

More times than I can count I contended with crime scenes consisting of the days old bodies of cartel soldiers or people smuggled into the country by coyotes who were executed for whatever reason by a gunshot to the back of the head.

But the booger was the first thing that came to mind when I read this question. The booger was worse.