Nominated by obvious follow-up
I'm assuming the past tense version is more popular with the top answer(s).
https://gamefaqs.gamespot.com/a/forum/5/5e299c68.png
https://gamefaqs.gamespot.com/a/forum/c/caec54c0.png
Recent top results:
Day 796: Why Did You
Do That?
(29%)
Day 795:
Pride
Month (31%)
Day 794: TIE -- Say
What?
-AND- Say
My Name
(14%)
Day 793: Fight
Club
(59%)
Day 792:
Night
Shift (20%)
Day 791: Monster
Mash
(39%)
Day 790: Halloween
Town
(22%)
Day 789: Why is
Gamora?
(44%)
Day 788:
Cookie
Monster (20%)
Day 787:
Were
wolf (15%)
Day 786:
Wicked
Witch (22%)
Day 785: Skull
Island
(24%)
Day 784:
Red
Skull (26%)
Day 783: Hunger
Games
(71%)
Day 782: Creepy
Pasta
(29%)
Day 781:
Rocky
Horror (14%)
Day 780: Psycho
Killer
(34%)
Day 779: Nightmare
on Elm Street
(26%)
Day 778: TIE --
Bart's
Nightmare -AND-
Living
Nightmare (8%)
Day 777:
Good
Luck (25%)
Day 776: Spirit
Halloween
(15%)
Day 775:
The Lord
of the
Rings
(13%)
Day 774: Haunted
House
(65%)
Day 773:
Jet Set
Radio (26%)
Day 772:
Cape
Fear (29%)
Day 771: Fear
Factor
(28%)
Day 770: Seven
-Eleven
(14%)
Day 769:
Dry
Bones (33%)
Day 768: Bone
r
(11%)
Day 767:
Bad to the
Bone (28%)
Day 766:
Black
Death (23%)
Day 765: Death
Note
(23%)
Day 764:
Bone
itis (27%)
Day 763: Just
Dance
(31%)
Day 762:
Donkey Kong
Country (54%)
Day 761: Val
entine
(12%)
Day 760: Tiger
Uppercut
(20%)
Day 759:
Paper
Tiger (29%)
Day 758: The Miracle
Never Happen
(23%)
Day 757:
The
Beach (10%)
Day 756:
Fried
Chicken (31%)
Day 755:
Mashed
Potatoes (27%)
Day 754: Corn
on the Cob
(22%)
Day 753:
Down
town (18%)
Day 752:
Pallet
Town (28%)
Day 751:
Bunk
Bed (19%)
Day 750:
Sun
day
Morning
(8%)
Past results:
https://board8.fandom.com/wiki/Fill_in_the_Blank_(Series%29
My response: Put the Bunny Back in the Box. (It's "couldn't" and not "didn't," but oh well.)
Only the exceptions can be exceptional.