Unexpected Richtofen Laugh

[nockscitney]

So I was suing this morning and in the Buddha room. I had two zombies left as you will see and upon attempting to shoot a the second I get this:

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Apologies that the quality isn't great, I took it on my iPhone and it is very sunny at the moment.

At first I thought maybe it was a sound effect to tell me I'd ranked up my emblem but that wasn't the case.

The second thought is the game thought I was doing some sort of glitch so it moved me and then played that sound bite.

Any ideas guys? It reminds me of when you throw a monkey outside the map on nuketown and Samantha laughs at you.