I couldn't help but notice the Bush beer can prominently occupying the scene which does in fact suggest redneck in nature Not sure if it fully applies here but one guy sure almost had toasted marshmallows as shown from 0.03 to 0.04 The guy holding the vacuum hose was also finger farking his cell phone suggesting the other sub species within the millennial sector. Pouring gas into a funnel with a hose attached using one's thumb as the shut off valve classic fluid flow control 101
However even using stop frame action I don't find an ignition source being applied could this mean the fumes created by the rapid air flow became statically charged to the point of self ignition via static electricity created by the velocity of escaping air from the end of the tube was actually a scientific experiment? with limited to no safety protocols being followed.