I turned on the lights this morning and sitting on top of one of the turbos was this snail. The shell is about 1/4" long and it's foot is about 1/2". I tried to get some pics but they came out pretty crappy. You might be able to see the antenna and tube sticking out. I checked a bunch of ID sites and didn't find one similar. And for a snail it's pretty fast. Here's the pics I got.