Mine:
1) A couple in Chino Hills who paid $600k in the Fall of '06. She's a stay at home mom, and he's a mechanic. At the housewarming party, they were overjoyed. The husband said they bought as much house as they could possibly afford. This was on an ARM loan but I don't know any of the other details. I do know they suddenly appeared quite wealthy - buying new SUV's, taking trips, and fueling her hyper-consumerism / shopping addiction so we can all guess what's up there. The house is now worth approximately $380k. I check every now and then to see if it's hit the market yet.
2) The details here have to remain fuzzy because this person may be reading this blog and I don't really want to be identified. A man (engineer) and wife (don't know what she does) - they live in the western-most part of the IE. They bought the place in the early stages of the bubble with a 30 yr. fixed. Fair enough. Then the next year, they sipped the Kool-aid... 100,000 cups of kool-aid to be exact. They rolled it over into a refi with toxic loan. The drive from there to OC for work was not pleasing him so he rented his place out and got a luxury loft apartment in OC. The rent was not covering the mortgage because by this time it had reset & recast but he thought he could just keep it up and make up the difference on his own. Fine and well until his renters stopped paying him due to their unemployment. They booted them and moved back in. Apparently at this point they either decided not to pay or couldn't pay and listed the house as a short sale. It's currently in escrow but meanwhile they're still living there rent-free. He seems quite happy and says he has a 1.5-year recovery plan all worked out. I have not heard the details of his plan, but by recovery - it seems he thinks he will own a home again, this time in an upscale O.C. neighborhood, after this "plan" succeeds.
3) Out-of-state couple. Just your typical family who bought at the peak, overpaid, and got themselves into a pay-option ARM. The clock struck twelve and it was time to pay up the large sum every month. They were not malicious but truly ignorant of how finances work. Deferred interest until it caught up with them. No HELOCs here, just did not understand the fine print on the loan docs apparently. After they stopped making their house payment they got plastic surgery, took many trips, dinners out, new wardrobes for the family, and so forth. The house is currently listed as a short sale. They've had a few extremely low ball offers and no bank approval yet. Now they've moved out and are renting elsewhere.
I am very certain there are more that I know in these situations but this is all I have details on so far.