I had a very large dark grey cat.  After about a year it was clear that he was going to be a very large cat.  For the majority of his 15 year life, he was about 30 lbs. 

He loved sleeping under a blanket but when he was younger he loved crawling under any blanket or rug.  Like a little kid, he thought he could not be seen when under something.

It was especially funny when he’d crawl inside a clear plastic bag and crouch down.  It was obvious that he thought we could not see him, all 20+ lbs of him as a younger age.