Hide in the closet, and have your friend start having doggy sex with a chick with her facing away from the closet. Sneak out and switch with your friend. Extra points if you switch back.
Therefore, I can only assume that the correct phrase is in fact 'Changing At Baker Street". As at Baker Street station it IS possible to change between the Hammersmith And City (pink) and Bakerloo (brown) lines.
When a waffle house cook quits abruptly mid shift and is immediately replaced by an unsuspecting waitress out of sheer necessity regardless of prior cooking experience.