Why not get a great big nurse's uniform, like size XXXXL, and throw it on over the top of your cycling gear before walking in. Then, as you walk past her blow up your cheeks and waddle past like really fat people do..... maybe even take a donut in with you and stuff it into your mouth just before saying "good morning" letting the crumbs shower down on your nurses uniform.
....but first you have to decide just how badly you want to work there