Let's just take a moment to appreciate the sheer volume of things he manages to keep in his pockets. In Genesis of the Daleks, the Fourth Doctors pockets are turned out to reveal a magnifying glass, that aforementioned yo-yo, handcuffs, a wooden whistle, a bag of jelly babies, a crystal, an etheric beam locator, a penlight, a card with a diagram on it, interplanetary business cards and a black marker cap. Back in Robot, his first story, he had similarly bottomless pockets. Among other things they included ball-bearings, a stuffed white dove, underwater goggles, a "freedom of Skaro" scroll, a pilot's license for the Mars-Venus rocket run, a galactic passport, a booklet marking him as an honorary member of the Alpha-Centaurian table tennis club, a deck of playing cards, a telescope, a metal flute, an extremely heavy business card and an unidentified brown, furry thing... It became something of a running joke that whenever he is searched, a pile of odd assorted items slowly builds in front of his captors.