A nearly impossible order would include stuff like minefield on featherweight day or Sweeper but you have to jump backwards from player podium to podium well doing 360s. They often result in short rounds that lack any LR what so ever. Mostly importantly, they aren't fun to ANYONE but the warden.
Defining nearly impossible orders would be just asking yourself "Is there a less then a 1% chance of completing this order? Is this order barely possible and requires either an impossibly high skill level or extreme luck? Are people calling it basically a kill order? Do rounds often end with all reds being kos and/or dead?" If answer yes to most of these questions, it's likely a nearly impossible order.
However, LRs can be an exception to this rule. Custom LRs can allow you to do Nearly Impossible Orders.
Defining nearly impossible orders would be just asking yourself "Is there a less then a 1% chance of completing this order? Is this order barely possible and requires either an impossibly high skill level or extreme luck? Are people calling it basically a kill order? Do rounds often end with all reds being kos and/or dead?" If answer yes to most of these questions, it's likely a nearly impossible order.
However, LRs can be an exception to this rule. Custom LRs can allow you to do Nearly Impossible Orders.