Do cats get bored?

I think cats do get bored. Why else is there stuff scattered all over when a person gets home, or in the morning? I used to have a cat that would knock ornaments off of the Christmas tree and play with them half the night. She also liked to get into my yarn bag; we left her and her kittens in the house one weekend we were gone (about 23 years ago now) and got home to find they had been playing with the yarn. It took hours to roll it all up and clean up the mess!