a QS and an architect are surveying the top floor of a new skyscraper. The QS turns to the architect and says "do you know, if you jumped off this building, because of the air pressure, you would get to the 5th floor and be sucked back in". "Bullshit" says the architect, "I designed this building, thats impossible!". "seriously" says the QS, "watch" and the QS jumps off the building, sure enough he gets to 5th floor and flys back in the window, "Jesus, thats amazing" says the architect. At which point he jumps off the building, drops to the ground floor and dies. A nearby builder looks at the QS and says "you know something superman, you can be really sick sometimes".