Because 7 8 9.
Because 7 8 9!
Because 7 ate 9.
All the extra cubholders.
A Def Leppard.
Because they don't exist
Omega!! Note: surely it already exists but I thought of it independently and am proud of my terrible joke!
Because 7 8 9. (7 ate 9)
Because 7 8 9 A