There has been several good reminders on the forum latley - thought I would toss one out there.
Having been around sporting clays competition for several years I saw at least 3 seperate accidents ( with no injuries thankfully) to people using screw in chokes.
All of them had something stuck in the choke when it was insertied into the gun and the shooter did not check them out thouroughly.
Ear plugs, loose change etc all can do it, one guy had put a acorn in his pocket earlier in the day!
So, as we head out, especially with young shooters, give them a reminder course to look before installing!