NANOG70 tee shirt mystery

[mpetach at netflight.com (Matthew Petach)]

So, I've been staring at the NANOG70 tee shirt for
a bit now:

https://flic.kr/p/VejX5y

and I have to admit, I'm a bit stymied.

Usually, the tee-shirts are somewhat referential
to the location or to a particular event; but this
one is leaving me scratching my head.

Is it perhaps a shot of the network engineering
"Ooops (I broke the network again)"  concert
tour?

Or is there some other cultural reference at
play that I'm not aware of?

Enquiring minds want to know!(tm).  :)

Matt