|Purpose||To see who's at the door in advance|
|First appearance||"Bathtub Bashful"|
The mechanical Tells-Me-Who's-Knocking-at-the-Fedora is another one of Doc's inventions. Similarly in design to his regular hat, the Tells-Me-Who's-Knocking-at-the-Fedora tells its user who's at the door before greeting the person. In its appearance in "Bathtub Bashful", it is somewhat a failure -- Doc says it's a delivery man at the door when it's actually Queen Delightful, Lord Starchbottom and Sir Yipsalot.