I don't believe I've ever specifically bared my bum to randoms in public. Not that I'd be unwilling to under the right circumstances, but those circumstances simply haven't come up. I'd happily have participated in this event, for example.

I have not ever thought to drink from a shoe, however. And I'm really struggling to imagine the setting where I'd do that. Perhaps if I had just won a Formula One podium spot with Daniel Riccardo? Yep - I think I'd participate in a shoey in that situation.

Is this how tourists become were-Australians and start walking on the ceilings when they come back to the northern hemisphere?

I haven't, but years ago a manager from a company I worked for did one at a staff party. It was quite funny because she was an adult migrant from India so I'm not sure anyone expected it.

Watch it u might just get ur citizenship revoked for that admission.

Or be court ordered to do an uggboot shoey.