The California Trapdoor Spider constructs and lives in a silk-lined burrow. At the top is a D-shaped hinged lid which fits very tightly into the opening. The door is kept closed most of the time. If prey nears, the spider captures it and takes it into the burrow. It never strays far from its burrow.
I get constant email spam from Alan Grayson, a State Representative from Florida which isn't even my state, after voting in an online poll he held about a month ago. When I finally got annoyed enough with it to stop it, I found this passive aggressive message trying to shame me out of unsubscribing.