One daughter-father team has created the ultimate in Time and Relative Dimension(s) in Headwear — the light-up TARDIS Fez. You can behold its awesomeness in action in the video below, but you can also head over to Tally's Treasury to learn how to make one for yourself!
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Fezzes are not cool. But daughters and fathers working on geek projects together is VERY cool.
It is very nicely crafted though. Just needs a blinky-light.