His fan following across the world is anybody's guess. But what came as a surprise was that two cartoon characters roamed the streets of San Francisco looking out for Bollywood superstar Shah Rukh Khan, who was shooting in the city.

While shooting there for "My Name Is Khan", Shah Rukh was visited by two green coloured, flubber-like characters Chouw and Mouw who had roamed across the city searching for the actor.

The characters barged into Shah Rukh's van and when they were stopped by the security, they started screaming for the actor who stepped out and surprised the unit by identifying them as his friends from India.

Chouw and Mouw also got him a gift, which was confiscated by the security, who looked at it suspiciously. The gift box contained a switch that Shah Rukh hit to unveil Videocon's green lava-like new logo over the Golden Gate Bridge.

"I am delighted to receive such a wonderful gift from my friends Chouw and Mouw in the form of the new Videocon logo...I am confident, my best friends Chouw and Mouw will be loved by all and they are sure to capture millions of hearts and create smiles across the world. My best wishes to Chouw and Mouw, " Shah Rukh said at the location, according to a statement released here Wednesday.

Being the central characters of the new ad campaign, Chouw and Mouw depict positive dimension of change. They are shown in different situations transforming the lives of people. While Chouw is the bigger, giant looking character with a kind and empathetic heart, Mouw is tiny and small but clever and street smart.

Produced by Karan Johar, "My Name Is Khan" is about a Muslim (Shah Rukh) who suffers from Asperger syndrome, a form of autism which impacts social interaction abilities and he is arrested as a suspected terrorist in post 9/11 Los Angeles after the authorities mistake his disability for suspicious behaviour.

Also starring Kajol, the film is scheduled for a 2010 release.