Too many .... what ?

Can you guess the answer ?
Is it :
a ) people out shopping ?
b ) Christmas cards still to be written ?
c ) things to fit in the fridge ?

Well of course all of these answers are correct, but the answer I was thinking of was -

DOORS OPEN ON THE ADVENT CALENDAR ! EEEEEEEEEEEEEK !!!!

( Which explains today's thoroughly lazy photo, taken while I was queuing at the check-out ).