5 weird ways to put out a candle

My uncle was a physics teacher, and on his last ever day of school-teaching he asked his first year class if they wanted to see some really unusual ways to put out a candle.  
He used the liquid nitrogen one, I think he did CO2 as well, he used a blast of sound from a loudspeaker and then for the final one (it turned out he'd been drinking at lunchtime) he unzipped his trousers and about 2 minutes later the candle was completely extinguished.  That was his last day of teaching - such a shame - he was only 29.