My cat eats paper.?

My boyfriend is an architect and he works at home. When he spreads out his plans (blueprint size) my cat sits on top of them and starts ripping them up with his mouth. I have never had a cat do this before. Its like the old saying for kids " The dog ate my homework". Well, my cat at your architect plans, sorry, I will have them to you soon I promise. I need more time. Does any one else have plan and paper eating cats?