Mixing an invisible laser and a fire alarm made for a disastrous demo

Dark deeds are no way to close a deal Who, Me?  Happy New Year, gentle readers, and welcome once again to Who, Me? – The Reg's regular roundup of rapscallions and rascals committing tech atrocities and (sometimes) getting away with it. This week it's got a sci-fi twist because the disaster in question involves lasers.…