For those that deal with American currency...what's the smallest coin you'd stoop down and pick up off the sidewalk?

You spy paper money at the bottom of a public toilet. The toilet appears to be clean (someone flushed it right before). What's the smallest denomination you'd reach in and grab?

Outside a bar, you see a puddle of vomit. It's fresh. Whoever had done the dirty deed ended up dropping a bill in the mess and left it behind. It's floating on top of the pool of throw-up. What's the smallest denomination you'd retrieve, clean and pocket?

While walking late at night, you see a skunk. It doesn't notice you. You also notice a bill directly beneath its feet. Let's say you can't wait around til it leaves because you NEED to get home like five minutes ago. What's the smallest denomination that would make you try and scare the skunk off and risk getting sprayed?

You're at the horsetrack. You have $100 in your pocket. Someone who looks like an older jockey (retired) tells you that he knows the scoop, that #4 is a shoo-in, and that's what he's betting on. He knows people on the inside, and that's how he gets his tips. #4 has 8-1 odds. After getting the tip, how much of the $100 will you bet?