After a huge long debate over a friend telling me he had a turbo (I see no piping, BOV, or anything) and him telling me that some whining noise his engine makes because its fucked up is the turbo spooling...he really went all out.

Put a boost gauge in the car, and as it fluctuated from like -1.5 bar to -1 bar when he floored it, proceeded to tell me how it proved that he had turbo. Yes...negative psi...vacuum...*sighs*