I know, they're harmless and not that big. But they're still sharks.
But it's said they mainly stay away from humans, and subsist on a diet of croaker fish....
Ironically, the Enviro-Sports Sharkfest Swim Series no longer hosts a Potomac River Sharkfest swim. For the past few years, they held a 3K swim (~1.8mi) under the Harry Nice Bridge on the Potomac River from Aqua Land, MD to Dahlgren Wayside Park, VA.
I completed the swim in 2012. While the distance is much less than the 4.4 Mile Great Chesapeake Bay Swim, the times were slow due to extremely choppy water and a strong current.