I love this thread! 
Thanks or starting it @lovablequalities
My I offer mine...
Whenever me and DH hear a phone ring, we say '4291' from the old episodes of One Foot in the Grave. That is what their phone number was, and they used to say it when they answered the phone.
Also, PIVOT from Friends of course, whenever we are moving something about. Lots of things from Friends actually, and Red dwarf and IT crowd too. And also quite a few catchphrases from old Carry On films...
Also, whenever England - or our fave football team - have played a bit average, we say 'did you see that ludicrous display last night...?' from an I.T. crowd episode. And also (as a pp said,) 'everybody's dead Dave, they're all dead Dave, Everybody's dead Dave! And SOUPER from Red Dwarf.
AND 'what's occurring?' from Gavin and Stacey. And occasionally 'hello Gavlar!' And when someone accuses us of something we say 'why don't you PROVE IT!' in the voice of Snape from Harry Potter...
And whenever 'knowing me knowing' you by ABBA comes on the radio, we say collectively AH-HA. And of COURSE, we always say 'gaaaahlic bread' a la Peter Kay! And we have multiple catchphrases and lines from Auf Wiedersehen Pet ... There a LOT of catchphrases from comedy eh? 
Lots from One foot in the grave, Only fools and horses, IT crowd, Red Dwarf, Friends, Alan Partridge, all sorts...Brilliant. 