Sadly, this is why I never do any housework: I don't have time during the week, but I want to spend my days off relaxing, not doing more work.
On the other hand, there was a time in my life when I was like Ernie, with an attitude of: "So what if stuff gets wet? It'll dry off eventually." Nowadays, however, mildew is one of my worst fears. Seriously, I have nightmares about it sometimes.
Apart from the fact that his hands don't work, is there a reason why Bert couldn't fix the window himself? Moreover, don't they live in an apartment, and therefore couldn't they call the landlords with maintenance issues like this?
Also, I think it's pretty funny that the end of the rain is accompanied by a musical fanfare. I understand the reason for it, but I still think it's funny.