If I were to go to Australia would somebody hand me a Vegemite Sandwich😀?

Nope. It's not a thing. 

No, because we know foreigners find them revolting.

No they'd hand you a spoonful of it and make you eat it

If you are an Australian in Belgium, it's compulsory to be given one by a burly dude.

Yep laced with arsenic but only too a stupid yank or a smelly pom

Just make sure you say thank you or you might end up with a knuckle sandwich as well

It is required by law that all Australian citizens carry a vegemite Sandwich on them at all times to give to foreigners, but in order for a foreigner to get one they have to say “ do you speak a my language?” We have some silly laws in Australia

...and he said “Oh! Do you come from the land down under?!”

they might if you go buy one