I don't know if all cats do this, but our cats flock to bed-making like moths to a flame. Start flapping sheets, and they come a-running. This can make it difficult to change sheets. These photos actually are in reverse order, but they illustrate our cats' affinity for interfering with bed-making. They like to lie around on top of the process and groom themselves:
They also like to roll around and play in the middle of the process:
And, of course, they like to crawl into the unspread covers and complicate efforts to spread things out:
All in all, it can be a little difficult to get a bed made around here.