drive-thru. >> hello. oh my god! >> hello! are you serious? >> oh snap. >> oh my god! >>gretchen: check out this worker. he can't believe his eyes. he did a double take and a triple take. but at least one worker was not scared. >> throw it in here. i'm a ghost. >> throw it in there? >> yeah, i'm a ghost. thank you. >>gretchen: the driver's seat is actually a costume. the driver is inside the costume making him look invisible. i still want to know how they do it. how do you make a costume invisible. we can do that with the weather wall. >> or harry potter, the cloak of invisibility. or you can think you're invisible. let me tell you what's