Depends where at. Never any issues with sharks here in Bali. Certain spots in Australia & elsewhere, common.

Though even without them, surf always carries certain risks if the waves are decent sized. I had a bail in February, surfboard smacked me on the head HARD and triggered a chain reaction of craziness. Haven't been out lately, still shooken up from the whole thing and body not fully healed yet. I can't imagine how much a shark encounter would shake a person up...