Are you allowed to use a ladder during a round of golf?
Well, creativity seems to have no limits when it comes to getting a good score!
See the video of the player whose ball was badly plugged in the lip of the bunker:
As you can see, this player moved the bunker-ladder closer to the ball, making it easier to play the ball because he stood on the ladder!
Was he allowed to do this? No. What he did was against Rule 8.1a(2) prohibiting building a stance. By doing so, he incurred a two-stroke penalty.
-> See the Rules School video (9th grade) about “Obstructions” (such as a ladder).
It could be argued that this player’s creativity should grant him a deduction of one stroke from his score – but unfortunately no Rule allows for that :-). Since the ball was not actually lying in the bunker (see the Definition of a “Bunker”) he could instead have taken relief without penalty for an embedded ball (Rule 16.3).