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It looks intimidating it happens every couple of years. >> it's rare the gorillas actually break the glass, but occasionally the glass will break op its own, but they have broke didn't before in the past, and it's usually more an engineering thing than it is a gorilla thing. >> reporter: these windows are designed to stay in tact to keep both animals and the public safe. >> it's a triple layer laminate. there's actually three panes of glass on top of one another. if one is broken the other two are in place. >> reporter: the animals continue to pound on the glass to date. calling it normal beha...

To live off this. i thought it would be cool to quit and do music for a year, that would be awesome and go back into the engineering thing. i quit the job and it continued on from there. ♪ it's magic you know never believe it's not so ♪ ♪ >> reporter: it's got to be insane to walk in a room where there's 3,000 people hanging on your every mash-up. >> yeah, it's been this sort of thing where, you know, it's evolved and grown. there's been big jumps and it's also been ten years. i've been able to really concentrate on adapting a show to each level. for years it was just me to 30 people. an...