Trolls.
They are massive in girth but not so much in intelligence. Being virtually blind they must rely on their keen sense of smell to sustain their equally massive appetites which consists of all forms of warm blooded mammals, those with fur, and those with skin. They choose to dwell underneath bridges because it gives them shelter from the sun which they must avoid at all cost for if they come in contact with even one ray, they are immediately turned to stone.
Another seldom known fact about trolls is they are fond of hiding away secret caches of treasures they reap from the silly humans that dare attempt to cross their bridge after the sun goes down. Now this choice is upon you; in order to collect this smiley do you go during the day under the protection of the sun, or do you take your chances after sunset?
Please choose wisely! Also, please be sure to look both ways before crossing the street.
FTF honors go to beretta123!!!