Only "I have got to put it down"!! amongst the panic overbreathing" Really can not tell whether this was staged or someone who had a panic attack after takeoff.
Listening to it again at full volume, I can hear a change in engine note between when he says "aaaaand, we're up" and the heavy breathing starting. That could be deliberate but it seems unlikely (surely) that someone would monkey around with the throttle setting at such a low altitude.
The breathing does sound very weird but I suppose could be explained by people reacting to stressful situations in strange and varied ways!