[kooler]

Another one I've used a number of times in a grocery store is when searching for refrigerant leaks in the display cases, the leak detector I use emits a rhythmic audible pulsing tone like that of a geiger counter... There's always that curious shopper that comes along pushing a buggy staring at me with that 'duhhhh what are you doing' look on their face... I can't pass up the chance to say, 'Oh it's okay, I'm just checking for radiation in the meat', then go on about my business as if it's nothing to worry about...