Manta @ SWSD. I've witnessed a walk-o-shame every time I've been. Even last weekend, I saw one that really surprised me (and I'm sure they didn't see it coming either).
Manta is already notorious for its weight discrimination, but what can they do?! Would it really be better if they started screening more people at the entrance just because they "appear large"? They apparently have an extra train designed with the heavyset in mind, but that has yet to be implemented... (plus, how does something like that work? Would you board like the handicapped entrance for Space Mountain?)
That said, the seats are realllllllly snug and cozy for the "average person"....which is good only for the "average person"