Angel-centric episodes of BtVS and AtS would be high on the list.
The episodes I'd watch are: Welcome To The Hellmouth, The Harvest, Angel, Surprise, Innocence, Passion, I Only Have Eyes For You, Becoming, pts. 1 & 2, Beauty And The Beasts, Amends, Consequences, Enemies, Choices, The Prom, Graduation Day, pt. 2, City Of..., The Prodigal, Five By Five, Are You Now, Or Have You Ever Been?, Darla, The Trial, Reunion, Reprise, Fredless, Billy, Lullaby, Waiting In The Wings, Loyalty, Sleep Tight, Forgiving, The Price, A New World, Benediction, Tomorrow, Deep Down, Soulless, Calvary, Orpheus, Inside Out, The Magic Bullet, Peace Out, Home, Lineage, Soul Purpose, A Hole In The World, Shells, Origin, Time Bomb & Not Fade Away.
That franchise really comes down to these episodes for me.
Up for consideration would be these episodes:
Roswell: The Pilot, 285 South, Toy House, The Convention, Independence Day, Max To The Max, The White Room, Destiny, Summer Of '47, Harvest, Wipeout!, A Roswell Christmas Carol, How The Other Half Lives, Viva Las Vegas, Cry Your Name, The Departure, Michael, The Guys And The Great Snapple Caper, Samuel Rising, I Married An Alien, Panacea, Chant Down Babylon, Four Aliens And A Baby & Graduation.
Heroes: Seven Minutes To Midnight, Homecoming, Six Months Ago, Fallout, Unexpected, Company Man, The Hard Part, How To Stop An Exploding Man, Kindred, Four Months Ago..., Cautionary Tales, Truth And Consequences, Powerless, The Second Coming, The Butterfly Effect, One Of Us, One Of Them, I Am Become Death, Angels And Monsters, Villains, It's Coming, The Eclipse, pts. 1 & 2, Our Father, Dual, Shades Of Gray, Into Asylum, Turn And Face The Strange, I Am Sylar & An Invisible Thread.
I Love Lucy: a general blast through favorite Desi Arnaz musical and linguistic humor segments.
I'd definitely have Amadeus, Elvis: That's the Way it is, Elvis on Tour (get it on DVD already!) and Aloha from Hawaii as some of the last things I'd want in my memory as I go out.
And I would make a few compilations of my favorite Elvis ballads (heavily '70s material) and play several favorite sections of Mozart's Requiem Mass in D Minor and Die Zauberflöte.
A few other movies like the original Star Wars and Indiana Jones trilogies, American Graffiti, Freaks, Babes in Toyland (March of the Wooden Soldiers), Grease, The Sound of Music, a few Disney films like Peter Pan, The Little Mermaid, Sleeping Beauty, Pinocchio, Aladdin, The Hunchback of Notre Dame, etc..., Hocus Pocus, Edward Scissorhands, Beetlejuice, The Nightmare Before Christmas, Boys Town, A Tree Grows in Brooklyn, The Wizard of Oz, Meet Me in St. Louis, The Princess Bride, Jailhouse Rock, Live a Little, Love a Little, etc... are what I'd also choose to watch.
It's largely what I watch anyways. I'd have to have a few old favorites, a few childhood loves of mine, a bit of sad beauty and a bit of fun.