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