"Free cheese only in a mousetrap," the classic phrase, meaning that there is no need to explain. However, as well ochchen successfully demonstrates little hero of the plot, at sufficiently deft handling cheese still becomes free without any implications. As in our daily life with you. Someone could easily overtake or brazenly attempts to catch it on the cheese or even some bait and freely leave and someone will stumble on level ground. Where everyone else everything runs smoothly.