Listen, chemicals are super awesome, and super dangerous. Best to enjoy them from the protection of your computer screen.
Ammonium dichromate looks pretty cool when you burn it:
Source: i.imgur.com
Aluminum meets bromine:
Source: i.imgur.com
Caesium and fluorine are a reactive combo:
Source: i.imgur.com
Water and liquid nitrogen make pretty good cover for escape:
Source: i.imgur.com