How do you get a friend to play with you?
Well... you can trap them in the corner, lay on them and read a story to them; weather they want to or not...
...or, you can wait until they're trapped and force them to play with all the toys you can find...
...you can also insist that they sit right next to you and watch a movie that you've seen 200 times while you tell them everything that's about to happen...
...and of course, you can dress the same so that everyone knows you're best friends.