Edgar Bergen and Charlie McCarthy's Top Hats

Origin
Edgar Bergen was a ventriloquist whose most famous dummy was Charlie McCarthy. He appeared on radio, which many considered odd as part of the act was seeing the discrepancy between when the ventriloquist and dummy’s mouths moved. The star remained Charlie, who was always presented as a highly precocious child, albeit in top hat, cape, and monocle. As a (wooden) child, Charlie could get away with double entendres that were otherwise impossible under broadcast standards of the time. Although not the most technically skilled, the quick one (or two) sided dialogue Bergen created between himself and Charlie made audiences latch on to their personalities.

Effects
McCarthy's hat will make anyone who wears it speak the thoughts of the person wearing Bergen's hat, in the latter's voice. However, only McCarthy's hat is in the Warehouse; Bergen's hat was lost. The user(s) will have a particular affinity for committing sneaky wordplay.