The Bengaluru Police came up with great idea to interact with the youth and, at the same time, guide them about safety measures.
Their main concern was to reduce the number of road accidents taking place especially involving two-wheelers. The message was that severe head injury can be avoided by using a helmet.

Riding safe with helmet. indianmotorcycle
As part of their unique attempt, the Bengaluru Police smartly made a reference to a character from the Game of Thrones to convey their message: ‘Always Wear a Helmet’.
This is what they shared on Twitter:

This is in reference to Oberyn Martell or Red Viper from GOT, who goes to fight with Gregor ‘The Mountain’ Cleagane. The Mountain crushes Oberyn’s head giving the latter a brutal death.
Also See

What Bengaluru Police is saying is that Martell might have lived had he wore a helmet. This in itself conveys a whole point and telling in a quirky manner that helmet can save your life from hazard.

UpRoxx.com
Talking about road accidents in India, the graph goes higher with each passing day. Be it a child sitting in front or the rider without helmet, both are likely to get harmed. The head is severely damaged which is often fatal.
As per the report published by Department of Community and Family Medicine, All India Institute of Medical Sciences (AIIMS), the highest ratio of accidents were seen of bikers. In the report it is well-stated that most of the accidents were due to absence of helmet.

Graph depicting that highest number of accidents involve two-wheelers. jotr.in
Neurosurgeon Dr K Ganapathy in an earlier interaction with TOI said, “The skull, on impact, swells up like any other bone. But the swelling damages the brain and can cause permanent damage.”