by 
agent1337
ANSWERS: 2
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http://www.coolscience.org/CoolScience/KidScientists/MethaneBubbles.htm http://genchem.chem.wisc.edu/demonstrations/Gen_Chem_Pages/06thermopage/combustion_of_methane_bubb.htm Be careful, though, these are very dangerous and some think they lead to global warming.
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Fart in the bath. Alternatively, methane is the major component of "natural gas" which is supplied to many homes. Disclaimer: I'm not responsible if you manage to blow up your house!
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