In order of least hated to most hated:
Service meeting - Sales meeting. But for a number of years I was in sales, so it was ok.
Book study - the shortest meeting and sometimes you would get to sit in a comfy chair. This was the meeting where you would hear the most off the wall comments.
Public Talk - depending on the speaker. Sometimes if the speaker was really bad, it was more bearable.
TMS - I try to forget
Watchtower - The first thing I would do would be to count the paragraphs and mentally note how long each paragraph should take. It was worse than Chinese water torture.