Findings:

• Bat, Bat, Come Under My Hat
• under my hat
• things to keep under wraps
• I do not like the sky night or day and keep my eyes on the yellow lines heading under the car
• Red Hat Software
• hat
• White Hat
• hats
• Black hat
• hat head
• The Cat In The Hat
• The 500 Hats of Bartholomew Cubbins
• Cat in the Hat Comes Back
• cowboy hat
• straw hat
• Magic Hat
• Red Hat Linux 5.2
• Tilley Hat
• Red Hat To Buy Microsoft
• Hatted
• Panama hat
• Men Without Hats
• Medicine Hat
• Jimmy hat
• Kerosene Hat
• Hunk of hat
• I have a tricorn hat
• pork-pie hat
• hat pitch
• hat lines
• hat with horns
• pointy hat
• wizard hat
• Scenes from the Hat
• Magical Flying Hat Turbo Simulator (MD)
• Put the hat on
• Red Hat Linux
• hat trick
• Where did you get that hat?
• party hat
• All hat and no cattle
• Red Hat Linux 6.2
• Devo Hat
• reservoir hat
• Using Red Hat and it feels so good
• Ong's Hat
• The hat game
• Pimp Hat (user)
• The Sorting Hat
• Red Hat Naming Scheme
• pizza hat
• Top hat
• At the drop of a hat
• making my cat wear party hats
• Chef's hat
• The Story of Jason Squiff and Why He Had a Popcorn Hat, Popcorn Mittens and Popcorn Shoes
• Hey Rocky, watch me pull a rabbit out of my hat!
• The Man who Mistook His Wife for a Hat
• Brain Teaser: Five Hats
• Answer: Five Hats
• hat (user)
• thoughts on the eve of a Red Hat installation
• Why have you shot him for pounding a corn hat?
• Red Hat Linux 7.x
• coloured hat puzzles
• mistletoe hat
• Fear of a Black Hat
• dual hat
• stetson hat
• the high hat
• Hats Off To (Roy) Harper
• Men in Hats
• The Quangle Wangle's Hat
• hard hat
• How to measure hat size
• Yellow Hat
• Goodbye Porkpie Hat
• The Shaman's Hat
• Jackie Chan's Polar Bear Hat of Doom
• gray hat
• Den Holocaust hat es nie gegeben
• The Hat Trick
• Jack "The Hat" McVitie
• All Round My Hat
• Big Hat
• Mein Hut, der hat drei Ecken
• Monkey! Bat! Robot Hat!
• Herr Kartoffelkopf hat das Tal seltsam gerettet
• locking your hat
• Men Without Hats are not Men At Work
• The Knapsack, the Hat and the Horn
• See You Jimmy hat
• throwing cards into a hat
• The Cat in the Hat by William Shakespeare
• Man, Hat, and Island
• Tando hat
• Wideawake Hat
• Mexican Hat Dance
• Hat Creek Observatory
• witch's hat
• Medicine Hat Tigers
• Tin Hat Trio
• Passing the Hat
• farmer's hat
• Dr. Seuss hat
• So her hat does not blow away
• Red Hat Squadron
• Throw your hat into the ring
• Red Hat Linux 9
• hat tax
• Poodle Hat
• tinfoil hat
• Goat Hat (user)
• Gnome Hat (user)
• A Hat Full of Sky
• sugar hat
• Silly Hats Only (user)
• ten-gallon hat
• stovepipe hat
• Red Hat Society
• cocked hat
• Girl with a Red Hat
• Red Hat Directory Server
• Beaver hat
• Top Hat (user)
• born under candlelight just from the edge of a knife, was it a life? or was it a light at all?
• Billycock hat
• coolie hat
• A red hat
• Rice Hat (user)
• Dean Hatt (user)
• warwalking antennas in his hat juiced and sniffing.
• hats (user)
• The Biggy Hat Show
• Medicine Hat, Alberta
• Straw Hat Pirates
• Prisoners' hat paradox
• kitty hat girl
• Hat Trick (user)
• I Put On My Robe and Wizard Hat
• Tell me a story about a burro, standing atop a mesa, surrounded by a flock of geese, being fed by a weathered old man wearing nothing but a Jimmy hat
• The Cat in the Tin Foil Hat
• Moth's hat
• Take my hat, my shoes
• Talk through your hat
• Roger the Hat
• Three times a charm, a hat trick in the park
• needs more robot hat
• Thirteen Years And One Decade Down! A Melbourne Nodermeet To Celebrate The End Of High School And The Decaversary Of Everything2 (Bring A Hat)
• Ich Hatt' Eienen Kameraden
• Hats of Afghanistan
• I wore the sun in my hat like a feather
• Thirty seven hats in search of a head
• Hatt's People
• On Running After One's Hat
• White Hat Alliance
• Jesus Hat
• I Wear the Black Hat
• thoughts on a hat as my grandfather nears death
• People are not wearing enough hats
• Hat Girl Saves Comic
• whoopee hat
• Bergère hat
• Picture hat
• Kiss Me Quick and Pork Pie Hat
• black sock hat
• keep it on the client side
• Keep doing nothing
• Keep out of the reach of children
• Keep your friends close and your enemies closer
• right to keep and bear arms
• I Keep Forgetting
• keep out of reach of children
• Raindrops Keep Falling on My Head
• Keep your number of takeoffs equal to your number of landings

If you Log in you could create a "keep it under your hat" node. If you don't already have an account, you can register here.