Wow, same thing happened to me! (I avoided the rim though) It was dusk and I was living in Guam when a truck in front of the truck in front of me lost a rim. I saw teh low rider truck in front of me bounce over the rim and then swerve into the jungle then the taillights dissapeared into the brush. I swerved around the rim then pulled over to see if everyone one was OK. They just hopped out of the truck and made their way out of the jungle and said they were OK. I then asked if they needed help like getting towed out (I had a 4WD Suzuki Sidekick). They said, "No" in such a calm manner it made us think that sort of thing happened everyday.

'00 Insight "Wazabi" -75,000+ miles
'03 Toyota Matrix - 81,000+ miles
'03 HCH-CVT-OSBM-41,000+ miles (retired 04-10-06)
"I'm very secure with my little Insight, no Prius envy here."