Occasionally, games will decide to give you a break and actually feature methods of skipping boss battles, most often by talking them out of fighting the player or by using some convenient environmental feature to instantly destroy them. Of course, skipping the boss may not be the best course of action if you earn a nifty reward by defeating it through normal means, or if there's one for Hundred-Percent Completion. But, hey, that's the penalty you get for taking the easy way out. Note that a Speed Run, particularly tool-assisted one, can make bosses skippable unintentionally.