A fully-assembled 235, including the flywheel, bellhousing, and clutch tipped over an engine stand after some of my students ignored my warnings about not reattaching it to the stand after the bellhousing was installed. It took 50-something stitches to patch up the kid's foot it landed on, and he was wearing steel-toed work boots. The day before that happened he had gotten 3 swats with the "board of education" for wearing tennis shoes in the shop!
Jerry