After reading this thread earlier today, I went to Target this afternoon. Sitting in a bike rack outside (unlocked!) was a perfect example, a cheapo full-suspension mountain bike that had probably come from that very store. (Do they have homing instincts?)
Anyway, this particular bike caught my eye because, along with the bouncy front and rear, it had a big ol' puffy gel saddle about the size of a couch cushion. I mean, my girlfriend's mother has a saddle like that on her bike, but she's 72! I guess whoever owns this one is REALLY into comfort...or those mountain bikers just aren't nearly as tough as I thought.