Drowning is no joke. In over half of teenage drownings, the bystanders stated they didn't get help because they thought the victim was kidding. In one of the articles below, lifeguards even admitted to not helping a drowning victim because they thought the person was playing around. Please don't "play" drown. Death can occur in as little as 4 minutes. If you see something, get help immediately. Every second counts.
Unintentional Drowning: Get the Facts
http://www.cdc.gov/HomeandRecreationalSafety/Water-Safety/waterinjuries-factsheet.html
Drowning Signs Aren't Like the Movies
https://www.youtube.com/watch?v=X1mVcSUttX4
Respect for Water Cuts Risk of Drowning
http://well.blogs.nytimes.com/2012/06/11/cutting-the-risk-of-drowning/?_r=1
American Red Cross Water Safety Quiz
http://www.redcross.org/prepare/disaster/water-safety/quiz
Are You Water Competent?
http://www.sunoven.com/archives/11474