Cannot Break Down a Door with a Sledge Hammer?

How can this be used?  Oh man, can we count the ways.  But let's start with one...

"Oh pick me.  I'll go first."

"But you have not been taught yet in helpful techniques."

"I don't need to be taught, I've done things like this back on the farm." 

How Not to Use a Sledgehammer by Jokeroo