Bollywood megastar Amitabh Bachchan, who shot with six kids for an ad film, says working with children can be as unpredictable as working with animals.

"Shooting with a bunch of the most fiery, well spoken, know it all kids...incredible conversations with them...its an education! It's the toughest job to shoot with kids...and also animals. You never know what they will do next," Amitabh posted on micro-blogging site Twitter, late Monday night.