We are trying to poison them.

You see, Vegemite is now Halal:

VEGEMITE has gone halal in a bid by food giant Kraft to make the national “treasure” available to Muslim Australians.

The label on Australia’s most famous spread has changed in recent months to include halal certification in a move some have described as “ridiculous” political correctness.

“Islamic communities are proud Australians and they want to be able to eat our national icon as well,” Kraft spokesman Simon Talbot said.

I think that this qualifies as chemical warfare.