This reminds me an old jewish joke about chasidim. A person visited a chassidic town and saw that all the chasidim when they entered the walked through doorway

This reminds me an old jewish joke about chasidim. A person visited a chassidic town and saw that all the chasidim when they entered the walked through doorways would dip their heads. He didn't understand why, perhaps it's a form of piety? So he asked them and was told "we do it, because 'the rebbe' does it". So intrigued, he asked the rebbe, why he does it. And he was told, "Can't you tell how tall I am? I'd bump by head otherwise".