Buses and autos. Two most unpredictable objects on Bangalore road. You don't know when they are going to take a turn. Some bus drivers are even capable of taking a 90 degree turn from a stopped position.

"Don't pollute air". To complete the one-liner most of the autos need one more sentence. "I am polluting more than enough".

An irony - most of the autos having the "Don't pollute air" sticker exhaust a as much black fumes as it can so that it no one else will dare to do so.