Cell phones: Recently, we've instituted a €10 fine for any cell phone use. The proceeds go to charity. An overwhelming success!
Cigarettes: Knowledge workers who smoke can make great intelligence officers. It is when the participants huddle outside or on the stairs to smoke that they lose their inhibitions. When our knowledge workers return from a cigarette, they always tell me an indiscretion or two they overheard among participants. Great fodder for synthesis conversations!