Favorite self-imposed challenges?

an oft-recycled and harsh self-imposed challenge:

4. Master of Kefka's Domain:

i walk aimlessly around Kefka's Tower without: engaging in close combat, pulling any switches, traveling through any tubes, and certainly flushing any toilets.

should i succeed, the timer will be at 99:59, and i'll be as blue as this website's default background.

nothing will have been accomplished, aside from maximum frustration in myself and annoyance in everyone near me.