For some unknown reason, Jack gets really excited whenever we pull out new towels. We recently discovered that when I am sitting on a towel to do stretches, he will get in the way because he just has to sniff every inch of it. He really doesn't appreciate the fact that I get in his way while sitting on the towel.
Trip put a towel down to do sit ups on the other day, and Jack immediately claimed it as his. It was too funny not to share. Jack must have learned that if you don't sit on it immediately, you may lose to someone else! Looks like Trip lost this time :)