Talk about christian missionaries, I remember a joke my dad told me. He said it was based on a real life event in the past.
He and a friend was in a crowded lift in some hotel. On the 5th floor, the lift stopped and a big foreigner (Western, of course) with a luggage bag made his way into the lift. At the same time, an annoyed patron blurted out, casually:
"Babi betul la omputeh ni".
He didn't say it out loud but people can still hear him - thinking that the foreigner would not have the slightest idea. When they reached ground floor, suddenly they heard someone say:
"Tepi tepi babi nak lalu."
Turns out it was the foreigner who said that. How embarrassing.