My own personal best was when I did what I oughtn'a ("do like you oughta, add da acid to da water") and added the water to a beaker of concentrated HCl, and promptly discovered that the chemistry teacher was hypersensitive to the chlorine gas which filled the room.
I live just down the street from this building. With all the fireworks and general commotion last night, I didn't see or hear a thing. Hell of a surprise this morning, though.
Trying to melt the snow with fire or electricity will be very expensive. The energy cost would be huge.