I have a bo that is normally very good about laying in the nest box but every 3-4 months will sneak into the shop and lay behind the air compressor. She will lay one egg and then go right back to the nest box the next day. this last time I happened to be in the shop and the compressor started up and it didn't bother her at all,popped that egg out before the compressor shut off. What I don't understand is how she can drop an egg on a concrete floor and never crack them.