Reason: From Die Hard to The Fifth Element to the other Die Hards, Willis has flashed his crooked smile while delivering one-liners, killing bad guys, and delivering one-liners after killing bad guys. It lets us know that he’s not taking anything too seriously — which explains how he managed to make the line “Yippie kai yay, motherf*cker!” immortal instead of ridiculous.
Terms: The smirk must not be overused in non-income generating situations. Therefore, Willis must continually occupy his mind with sobering thoughts during his downtime. We suggest he contemplate how Hudson Hawk is totally misunderstood.