They just blew up the shed. Then America and Australia peppered Japan with jabs to the midsection until America threw a roundhouse and knocked them out.
Literally that... if you've ever been at bars, a lot of drunk people get riled up when someone looks at them, and some drunk people look at others to rile them up... or just regular looking. It sounds stupid... but it actually happens. Then you get the "watcha looking at?!" angry drunk dudebro that tries to fight you. That's the reference. But historically speaking they may have been alluring to the fact that certain countries had specific ulterior interests in other countries.
Where Japan goes over to America's house and blows it up?
'If world war 2 was a barfight'