Or It is arguable that some sharpshooting acts fall into the category of impalement arts when they involve a performer holding up targets for a marksman. Or One of the most difficult and dangerous feats for a knifethrower. These are all obviously unsourced, contentious statements. I cherry picked these, obviously, as some of the best (worst?) examples of unsourced content, but it would be good to start by sourcing statements like these.