This video made the rounds of social media some time ago, but it seems that not everyone had an opportunity to see it.
I was running a table-top scenario with a Graduate Paramedic recently and the discussion turned to the virtues of Non-Invasive Ventilation and pre-oxygenation strategies using PEEP valves, which reminded me of this great video;
As the idiom suggests, a picture is worth a thousand words.
If you would like to dive a little deeper, check out these links to the wonderful Life In The Fast Lane Critical Care Compendium pages on Non-Invasive Ventilation and PEEP.