Sad to hear that your smart was the attention-getter in this situation. Mine was probably in a similar situation a couple weeks ago. I was coming out of a McD's parking lot, waiting to turn into rush hour 5pm traffic. It had just rained, a car full of a family of four slowed down for the light, stalled just after passing me. A van behind them slowed down, and a van behind that one didn't until the last second. Somebody was distracted somewhere, and my car was visible for 500 feet upstream. Fortunately no injuries that I know of... minor bump, no visible damage, everybody walked around afterwards. I was in no position to help (tired, hungry, sick) so I didn't stick around, and feel guilty for it... but none of the other 50 people stayed either.
Kinda shook me up to think I was involved as a contributing factor, but on the legal side, this situation just came up in my business law class - you didn't directly cause the accident. You weren't waving your arms to distract them; they chose to stare at something. If you drove a pimped-out Civic with spinners (fairly common in some towns) they'd be just as distracted and it's still not your fault legally. That doesn't change the bad feeling, but don't tell yourself that your smart "caused" an accident.