Answer:
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
When you are inside me you will be encouraged to slam other cars.
I give people a huge fright, but at the end I'm sweet. I normally celebrate at night, when there's less heat. What am I?
Every night I'm told what to do, and each morning I do what I'm told. But I still don't escape your scold. What am I?
Digital white-out.
No matter how little or how much you use me, you change me every month.