A holey hat holds no thoughts

Like many people, Hickey has been heard to say "I'm putting on my thinking cap." Unlike most people, Hickey's thinking cap doesn't seem to be very helpful. We recently discovered Hickey has had to print out a guide to alphabetical order.
This has lead us to speculate what Hickey's thinking cap might look like. You can expect posts where we show images of the thinking cap in the coming weeks. We also encourage you to share your own interpretations in the comments.

Ironically, this fellow's name is Dumb Donald