A few years ago I was in Atlanta for the ACC Outdoor T&F championships at Ga Tech. The day before the meet, some teammates and I went for a run across the interstate from campus in Atlanta. We went to this large park (can't remember the name) with large, open fields and walking paths. There was an overgrown woodsy area in the middle of the park with what looked like a trail heading into it, so we set off exploring down it.
Pretty soon the trail became more and more overgrown, and we started to notice a lot of small bits of colorful paper trash scattered on the trail. We then rounded a corner, and the trail came to a dead end next to a small rock face in the woods. We looked down, and to our horror realized that those colorful bits of paper were actually condom wrappers, and that we were surrounded by and standing on hundreds and hundreds of used condoms and wrappers. Needless to say, we ran out of there in a hurry.