I lumber because...
I am tired.
I am cold.
I did not get home until 9:30 last night.
I will not get home until 9:30 tonight.
I will not get home until 9:30 tomorrow night.
I have 45 items to mail by tomorrow.
I ate a McGreasy with a small McFatty and two McSugar pies for dinner yesterday.
But mostly, I lumber because I'm still wearing my snow boots with the laces untied.