I got over any inclination I ever had to buy candy from a bulk bin...especially if it's unwrapped...after I witnessed 2 little groady kids (boys, at that...not that girls would be any better!) staring at the candies, and then make a huge grab in the bin with their nasty little hands. Their mother had gone on with her shopping, and saw nothing. I just stood there and stared at them; in a strong voice I said to them "I Saw Exactly What You Just Did!" They took off!
No more candy from the bulk bin for me! I'm sure there are adults that do that, too.