1) Mixes of hydrogen and oxygen are highly explosive 2) Hydrogen tends to leak with ease even from metal containers (hydrogen molecules are the smallest). 3) Th

1) Mixes of hydrogen and oxygen are highly explosive 2) Hydrogen tends to leak with ease even from metal containers (hydrogen molecules are the smallest). 3) There is a tradition to use lighted candles at birthday parties. 1 + 2 + 3 makes for a disturbing (although admittedly fun) combination. https://www.youtube.com/watch?v=ce6imsXTkGQ https://www.youtube.com/watch?v=ce6imsXTkGQ