Crazy Awesome: Sirius really likes Stuff Blowing Up. In ch 6, he even breaks into a civilian demolitions company's warehouse to steal sixteen canisters of nitroglycerine, which he later uses to destroy a horcrux.
Ginny: How many of these do you think it will take?
(the horcrux is blown up by the first attempt, the force of the explosion knocking both off their feet through a shield charm)
Sirius: (grinning) Now that was cool.