We had a guy around here that had not picked him mail out of his box for several days. Went to check on him and found him completely wrapped around the pto shaft. Tractor had eventually run out of gas.
This was not a pretty picture and if you ever seen it once you would never forget it. There was not much left of him. No shields on this tractor at all.
This was an old H farmall so had to get off and on from rear so made it more dangerous but have seen others get clothing caught while standing along side the pto with equipment running. Not much fun for them.
Keep your shield on if you can.