18-liners? That's nothing.
Maybe a 15-or-over limit. I'm not sure what the punishment would be, but I imagine one could write a brief summary of it in exactly as many lines as their signature occupies.
Cell-phone users will have the those irritating damn ringtones stuck in their heads forever, as they are tied upside down, boiled in oil, and molested by evil vole-demons. And their only chance to escape is to make a call to God to ask for intercession, on an ordinary, regular phone that happens to be just an inch out of reach.
That, or they're forced to repeatedly try to sneak past a pack of rabid pit bulls, with a cell phone that keeps going off bolted to their spine.