When you get your word, immediatley start thinking of another meaning for it. I went straight to thinking about other things for "Caps". The gunplay meaning is like bullets, but theres a few other ways you could go. There was like a baseball cap, perhaps a shortened versian of captain, but I chose to go with bottle caps. Once you have your double meaning, think of a way you can link them. Popping caps is the way I went with this.
Bonus points go for making the first multi relevent to the punch, like the way my line above just flew off like one sentance as KNOW IT WAS AWFUL made sense in the line.
This is a bit more complex so get at me if you have any questions, and READ THE LESSON.