More crazy clock styles

Some more ideas on other ways to make a clock crazy (but, of course, still keep perfect time);

1. The wavy clock. Frequency proportional to a sine wave. That one sounds like fun, actually. It'd probably have to be table-driven. No sense doing actual floating point on a battery powered ATTiny.
2. The lazy clock. Pick a random number of seconds and just stop. Then tick at 10 Hz until you catch up.
3. The zany clock. Pick a random tenth-of-a-second within each second for the tick.

Anybody have any others?