I knocked a vacuum line loose once while doing an oil change and it wouldnt turn off. It was still new to me and i didnt know where to start looking, the stop lever didnt turn it off (it would almost try and stall, but not quite) so I removed the intake ductwork from the turbo and just put my hand over it. It sucked pretty hard but shut down within a second or two.

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Matt
2003 Jetta Wagon TDI 145,000MI
1999.5 Jetta TDI 287,000MI
2001 Suzuki SV650S 26,000MI
2008 Yamaha Vino 125 11,000MI
http://www.crazymatt.org