In Japan, a Japanese man often says one of these as a means to propose:
パンスを洗ってください Please wash my underwear.
毎日、みそ汁を飲みたい I would like to drink miso soup everyday.
In Singapore, a Singaporean man may ask, "Shall we get an HDB flat?" to propose.
HDB is government flat, and big subsidies are given for first time home owners, usually the newly-married.
Are there any interesting ways to propose in other cultures/languages?