A re-enactor was injured by a PAK-38 during a re-enactment which was done before the start of a holiday parade. The news report wasn't to clear on what happened, but it sounds like the shell ejected unexpectantly and hit the re-enactor in the leg or possibly the breech hit him in the leg.
http://www1.whdh.com/news/articles/local/boston/12004756388722/man-injured-during-wwii-reenactment/