Whoa, you're the only other person I've ever seen with that Cambodia t-shirt. I found two of those once at a thrift store in San Diego and never had any idea why they existed, I still have one.
....i bought like 10 of these tshirts on a market in cambodia, 10 years ago, 1 $ each and thats the only one ive left. that sign "danger mines" is standing around everywhere in cambodia, when you leave the save footpaths, because cambodia is still full of landmines. so they print these tshirts as souvenirs. cambodia is a hell of a country btw!