Toilet training
So I actually enjoy potty training. Granted there are a lot of goals that I like more (object imitation with discrimination is really fun) but potty training is one of the most satisfying successes, to me. I get to watch kids increase their independence in real time. I've also seen kids' behavior change positively after they've completed toilet training (e.g. fewer instances of crying during sessions because they find their wet pull-ups uncomfortable). If I have a client who hasn't completed potty training yet and I'm told they're starting potty training, I am happy to support them with that.