Just my random memory recollection:
He goes by the name TY Koay, Jonathan Koay, https://www.linkedin.com/in/jonathan-koay-2762b07/, https://www.facebook.com/jkoay, from Malaysia, husband of (I think) Sandy Ma, graduated from Drexel University in Mechanical Engineering. Claimed to be Christian.
I meet him while I was in Drexel. When he was moving back to Malaysia, he had me help him ship his packages back home since he had to catch his flight. He gave me some money to pay the carrier (probably $100, back in the 2000s), telling me that it's more than enough. But as it turned out, the shipment costed more, probably double what he gave me. I paid the extra for him out of good faith. After that, it wasn't easy to reach him, I would say he's just too busy, instead of hiding from me, I would think I knew him enough to make this conclusion.
Years later, when I could get a hold of him online and told him about the shipping fee he owed me, he denied the extra cost and stopped talking about the shipping fee since.
For someone of his career and character, I don't think he was trying to cheat me out of a little $$$. He would probably think that I was the one trying to rip him off for some extra cash. However, I would say that he is rather irresponsible in such matter.
Bottom line, I should always be open to be his friend, but when it comes to monetary trust, he does not have good credit of faith, and I should be aware of that.
Update (6/19/2017): ...and thanks to my mom's reminder: Always keep the receipt. This matter is so long ago, I really don't remember the exact amount Jonathan owes me, which is not the point of this entry anyway.
Update (6/23/2017): I have actually dealt with this matter before. I was wiser then. So I'm going to categorize this in "Faults".