Weird Noise-Didn't lose a perma perk?

[heyitsbak3s]

Hey guys what the hell does this noise mean? People told me it was from losing a perma perk, only problem is I didn't start the game with any perma perks so what the heLL did i lose?

http://www.youtube.com/watch?v=1O2bT9dA4Z4

heres the link if that doesn't work.

http://www.youtube.com/watch?v=1O2bT9dA4Z4

[BEYOND]

I don't believe this mystery has been solved yet.

Certainly has happened a lot though through YT videos.

Maybe it has to do with rank?

[heyitsbak3s]

I didn't change rank at all during the game, I also should add I have done neither side of the easter egg. I do mention that in the video and I looked around at various locations to see if anything happened at the time of the noise, but got nothing :?

[Edward Richtofen]

Am I the only one who has never lost an unlockable ability? I got head-popper, never lost it, sometimes I get it again, but I always pop heads. Quick revive the same, never lost it.

I don't have the board one.

[Vengefulxdjinn]

I have got quick revive and never lost it, however i have got "head popper" a few times noticed again couple of days ago and the weirdest of all was i was playing last night (we was camping in PAP room for a laugh) and i got my 'Metal' boards, however i then lost it like the next round!

Now im convinced that it has something to do with insta kill because everytime ive lost something it seems to be during/after insta kill now me and my mate both lost it at the same round last night and both right after insta kill.

i mean seriously i have no idea! ha

Dan