[The Squatter of Amon Rûdh]

These few spring to mind:

Fëanor: reading a book called Jewel-Making Made Easy

Sauron: Making a picture of a kitten in counted cross-stitch

Radagast: Buying a copy of 101 Pigeon Recipes

Gandalf: Using his time in the library of Minas Tirith to look for pornographic woodcuts

Thorin: Playing Seamus the Happy Leprechaun at a children's party (what exactly did he do for a living when living in exile?)

Glaurung: Singing I'm a Little Teapot with actions.

Wormtongue: Pinning Saruman's portrait to a dartboard

Túrin: Asking Beleg to get rid of a spider for him.

Sam: Pawning the Baggins family silver to buy beer.

Treebeard: Herding trees into a paper mill.

Celeborn: Using the Mirror as a latrine

Aragorn: Using the Palantír of Orthanc to watch Arwen bathing

Denethor: Playing with a toy ship, with appropriate sound effects

Eärendil: Landing in Middle-earth and pretending to be an alien to confuse people.