Spot the TARDIS
From Tardis Wiki, the free Doctor Who reference
Spot the TARDIS was one of the parodical Doctor Who-themed activity pages in 1987's The Doctor Who Fun Book.
As its name implied, the supposed rule of the game was to try and spot the TARDIS (whose chameleon circuit had at long last been repaired by an unspecified incarnation of the Doctor) in a picture of a bucolic fairy-tale landscape featuring fluffy clouds, tress, and even a fairy and a gnome. The joking "correct answer" was that the whole, physical picture was the form the TARDIS had taken, and consequently urged the reader to be careful about how brutally they closed the Fun Book again.