✔ 最佳答案
get a bottle of chloroform, soak a piece of cloth, and mask it on your face...
make sure someone is there to remove it while you are away...
2010-05-09 12:27:49 補充:
another way, this may not work for everyone everytime....
knee down, try to hold your breath, breath out and try not to breath in, hold it for as long as possible. when you can not stand it, then stand up as fast as possible and breath in....