Krash! is fairly self-explanatory.

Thud! is the sound of a papoose being hurled unceremoniously on the hard earth. Try it yourself at home and you'll find it's pretty accurate.

Blamm! is the sound of sharp, small explosion, usually of a container. It should not be confuse with Boom!, which is used for larger, uncontained explosions, or Ka-booom!, which is for buildings being blown up.