Hide and seek

Hide and seek was a game often played by children.

Tony Barker and Amy Barker were playing hide and seek when they discovered the Doctor's TARDIS, which Amy had decided to use as a hiding place. (PROSE: The Monsters from Earth)

On at least one occasion, Rory Williams played hide and seek with Amelia Pond and Mels. He hid for hours while Amy and Mels neglected to look for him as they were talking about Amy's imaginary friend. When confronted about this, Amelia told Rory that they just hadn't found him yet. (TV: Let's Kill Hitler)

When Gwen Cooper arrives at the Hub to tell Jack Harkness about a lead she found on Jonah Bevan and accidentally walks in on him and Ianto having sex, Jack quips that they could have used her during "naked hide and seek." Ianto quips that Jack always cheats (TV: Adrift)