Cornflakes
From Tardis Wiki, the free Doctor Who reference
Cornflakes were a breakfast cereal that Luke Smith included in an early attempt at a joke in 2008: "I am so hungry, I could murder a bowl of cornflakes; does that make me a cereal killer?" He was bemused when Maria Jackson didn't find it funny. (TV: Warriors of Kudlak)
Jackie Tyler had a box of cornflakes in her kitchen in 2007. (TV: Love & Monsters)
On the morning of her family's visit to her father's grave, Tanya Adeola was eating cornflakes. (TV: Nightvisiting)