A Blind leading the Blind
El burro hablando de orejas
This saying is used to talk about an inappropriate leader who would eventually lead their followers to a disgraceful situation.
This idiom was first used in the Bible, in Matthew 15:14 we can find, “And if the blind lead the blind, both shall fall into a ditch”. We currently use it when we notice a person trying to teach others how to do things at which they have always been unsuccessful.