Razor-edged Hat
One of the hats in flight
Seen in Episode #3: "School Days"
Kind of device Weapon
Organization CONTROL

Bowler hat with razor-sharp edge; used as throwing weapon.

Unfortunately, hats tossed in practice at the CONTROL Training School tend to crash into the house of next-door neighbor Mrs. Green.

[Episode #3: "School Days".]

Reality Check: The razor-edged bowlers resemble that used by the villainous Oddjob in the James Bond film Goldfinger. The film itself is parodied in Episode #42 as "Bronzefinger ".