Schrödinger's cat
From Tardis Wiki, the free Doctor Who reference
Sedanya gave a practical demonstration of Schrödinger's cat at the Time Lord Academy. The First Doctor, however, stole the cat. (AUDIO: Blood of the Time Lords)
Alistair Gryffen used the exclamation "Schrödinger's cat and kittens" to express shock. (TV: Oroborus)
