By intentionally causing a gas leak in a room and inserting a magazine in a toaster, it is possible to cause a large explosion (as shown in the movie Bourne Supremacy).

BUSTED
Adam and Jamie began by placing magazines of various thicknesses in toasters and timing how long they took to catch fire. The thinnest and fastest to burn, similar to common newsprint or comic books, took roughly 2 minutes to catch a flame rather than the 20-30 seconds observed in the film. Small-scale tests with mixtures of methane and air indicated that a methane level as low as 6% (the bottom end of its flammability range) could trigger a noticeable explosion.

For full-scale testing, they built a replica of Jason Bourne’s apartment, including the toaster, magazine, and methane supply. Their first attempt at an explosion, using the circumstances shown in the movie, did not give any significant reaction, and the myth was declared busted. A second attempt with a higher gas concentration and a fireplace starter log as the ignition source led to an energetic fire, but no explosion. Adam and Jamie made one last attempt, using enough methane to achieve a 9% concentration (the center of the flammability range) and a set of fans and diffuser hoses to mix the gas and air thoroughly. This time, they were able to get one wall to blow out and set the apartment on fire.