Because there's no one else to wag it for him.
or
When it came time to pay, the skunk didn't have a scent, the deer didn't have a buck so they put the meal on the duck's bill.
or
The same as a regular year, but with less calories.
or
Does it have to be a light bulb? I've got this neat candle holder...
or
I am feeling pale today.
or