Funny, the OP's question makes me think of my ex-husband who always wanted to grow his hair longer than the brothers thought was 'decent' (especially his father who was PO at the time). But he always waited weeks before he finally went to the hairdresser, even when several brothers in the hall came to him with semi-sarcastic jokes. And of course his father wasn't pleased, but that was probably the main trigger to NOT go to the hairdresser 'in time' (funny thing is that our son has the exact same attitude and sometimes waits months before going to get his hair cut. Even though he's not a JW there are lots of people who think it's necessary to make a comment about someone's hairdo when it's getting longer than 'usual'... they just don't understand that the more comments they make, the longer he'll wait hahaha).
I also recall the shock in our last hall when my ex came in one day completely bald! He had a bet with a colleague: he would get 500 Dutch guilders if he would let his colleague shave his hair off. The colleague thought he would never do it, being a JW and knowing that I wouldn't really like it (understatement LOL)... but my ex said "fine, go ahead. Oh and thanks for the money". He came home from work and rang the doorbell, so I would come to the door to see it while his colleague was still there... Jaw dropping moment, but I barely showed it. I stayed pretty cool and asked "what happened?" and then he showed me the money he received. And that was that... LOL. That night or the night after we went to the hall... really hilarious! Nobody dared to ask him why he did it, they totally ignored his lacking hair!