so many good answers that I'm going to have take a different route. As for a scent that turns me on; one of my cash customers walking in with a fistful of fresh smelling Benjamin’s. I never appreciated my cash customers as much as I do now. Those Benjamin’s smell like pussy to me.
On the bad experience side, I've got a slightly nasty spring break experience that my friends still don’t let me live down to this day. Roll the calendar back just a few years ago to a spring break trip I made to the Bahamas. I hooked up one night and ended up on the beach with a young coed. Many hours later I stumble back to the condo I was sharing with 7 other friends. There was only 1 bathroom so while I go to take a whizz there are 2 others in there at the same time. One was brushing his teeth and the other was probably popping a zit or something. Anyway, I start peeing and it smells horrible in the bathroom. My so called friends are rolling on the floor laughing and looking at me. I look down and my schlong is covered in fricking doodoo. These were my college days so I was polluted with just about any substance I could get my hands on. I don’t remember screwing this chick in the ass, but I guess I must have. Funny thing is I spent the next few nights looking for this chick to see if I could repeat. My buddies still bust my chops and tease me that I was so fucked up that I probably fucked a guy. Nice. I was coherent enough to know it was a chick…although she did have hairy legs now that I think back…Lol  
Maybe I should've used an alias on this one? I can see you girls putting me on the "shit" list now.