Mortar board
From Tardis Wiki, the free Doctor Who reference
The newly regenerated Seventh Doctor tried on a mortar board and academic gown. Hoping she would contradict him, he commented "a little portentous perhaps" to Melanie Bush, actually the First Rani in disguise, before dispensing with them whilst the Rani remarked behind his back "pretentious is the word." (TV: Time and the Rani, PROSE: Time and the Rani)