Ha! Mailroom guy at a company I used to consult for found a black widow behind some file boxes. He trapped it in one of those clear, rectangular paper clip holders with a round magnet in the opening. He put a couple pieces of tape across the top to let air in but keep the widow trapped. When he left for lunch we swapped out the container with the trapped widow for an empty one with the same pieces of tape across the opening. Whe he got back he sat there and stared at the empty container for a good 15 minutes with a look of fear and confusion.