unlike Howard, Tibby is capable of lifting must greater volumes of luggage, but the quality and speed of her lifting is (positively) correlated to the size of her tip, and cheapskates will frequently find their valuables decanted down exceedingly long flights of stairs, and deposited onto the street through the elaborate mechanism of an open 5th floor window and a poorly-fitted landing carpet

https://www.youtube.com/watch?v=BBH2slZw44k