must be someone else

Will you say
Without pause or delay:
"Must be someone else ... It can't be him
It's far too cheery ... Not at all grim
Then again perhaps he's changed
Or maybe he wasn't really deranged"
Or perhaps it's just time for brighter colour
No more dreariness or ponderous dolour
Instead to wish all you blippers
In front of the fire ... in comfy slippers
Awaiting the season in anticipation
Of laughter, joy and festive celebration
"Be of hearty good cheer
Throughout this time of year"

PS (if not all PC)