Road Rage Granny - Spospe
I know no more than shown in the clip, but assuming that it is genuine, air-bags can be set off quite easily!

www.funmansion.com/videos/road_rage_granny_1.html

Road Rage Granny - Statistical outlier
Fake fake fake fake fake.

If airbags went off that slowly you'd be dead before they'd even started to inflate.
Road Rage Granny - frazerjp
Even if it was a fake, can it happen in reality?
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Its not what you drive, its how you drive it! :-)
Road Rage Granny - Blue {P}
Only if you can simulate the forces involved in a circa 25 - 30mph impact with your shopping bag. Unlikely.

Blue
Road Rage Granny - Spospe
I have heard of young people in the States setting off air bags by hitting the front bumper with a baseball bat. This would be a harder hit than the little old lady did in the clip, but quite easy to achive.
Road Rage Granny - Lud
Ask bb before he zips off to Finland to put the combs through their paces. He lets off airbags for amusement.

Bon voyage by the way bb.