We picked up Torin's stroller the other day, the Baby Jogger City Select:
Now, with the appropriate adapter, the car seat is supposed to attach to the frame of the stroller. We bought the adapter, and Joey has read the (rather vague) instructions dozens of times. He cannot figure out how to secure the car seat into the stroller. He's a smart guy, so I'm blaming this one on the adapter manufacturer.
Looks like we get to take both contraptions and the adapter back to the store this weekend to see if someone can school us or get us the right part(s), if necessary.
(The whole time I was writing this post, Torin had the hiccups. I wish I were able to help him, but at the same time, it's just so darn adorable.)