Alligators. Nothing compares to the abject horror of watch a movie where some tool and his girlfriend go swimming in a FL swamp, a huge gator bites the chick and drags her under while the coward shits his pants...Then I thought to myself, hey, how about harnessing all that fear into rage should I find myself in that situation, and go wrestle that gator all Steve Irwin style? Boom, someone's getting laid that night... after the hospital visit.
Spider webs are pretty creepy, but Spiders are quite reasonable creatures that earn their keep by controlling the insect population.