I have yet to have one even consider going broody... but I have seen posts occasionally about a hen pulling off a clutch here and there. I got my best broody off of craigslist- basically asked if anyone had a cranky beotch that was biting, not laying and hogging the nestbox, and I got a bunch to pick from. One chicken persons pain in the tush is another's treasure, and people were releaved to see their broody grumps go to where they could raise some babies.
I also found that grafting chicks onto a banty broody from the incubator worked well. I had a silkie hen that never left my incubator room. She would start them, and I would pull a switcheroo on her when the next batch hatched- just covered her rubberaid tote w/ cardboard after sticking babies under her. Worked great, she would keep them the first week or so, and then they would go into a simple setup with far fewer worries.
... she did 17 clutches of less then 10 chicks for me this way, and the chicks never pasted up or had any of the usual new hatch issues... although I think she was wondering why she had to occasionally re-teach them stuff, and I had to keep the colors the same or she would get pecky w/ the odd one.