A few years ago...
... while I was having my breakfast -espresso coffee + pincho de tortilla - at a local bar, a guy dressed in a blue jumpsuit entered the place carrying an orange plastic case. He looked around and left the case in an empty corner of the bar. The barman, who knew him, asked what was in the orange case, and the guy explained it was a radioactive source used for inspecting pipes. He wasn't allowed to leave it alone in his van, so he had to carry it everywhere.
For a few seconds, the only sound in the place was that of chairs inching away from the aforementioned corner. 8^)