"... bevor mir diese blöde Spinne die Fersen abklaut!!"

J is extremely chatty on weekend mornings, especially when well rested, and especially when he gets to play World of Warcraft. 

Since the game is new and exciting for him, and also highly narrative, it's a great opportunity to get him to talk a lot and to learn new words and concepts. I've been playing with him a good amount, sitting with him while he plays, reading the gamelore on the internet in German for him, and asking him what he has done and would like to do, etc. 

"... bevor mir diese blöde Spinne die Fersen abklaut!!"

This clause, with perfect grammar and syntax, and also highly unusual and creative (i.e., not based on a prepackaged idiomatic expression), burst out of him as he was being attacked. I was highly impressed.