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1) They make contact, and get just enough personal details like your name and number

2) They then ask you to watch some/one random channel which is broadcasted in Asia somewhere on a certain time

3) They then call you back AFTER the show and insisted that you won something, like in my experience.. once a new car, and second time USD 120,000.

Yep, just like that. As for the catch? It must be picked up somewhere at it's local source, from a country in Asia. 

So. On both occasions I have tried to find out what the catch is, and on both occasions they just go round and round and round trying to fetch more info from me. But I never got down to the bottom of it before my patience run thin.. 

I can only guess that they're conmen, which I don't care really, but I am intensely curious as to what strategy they're using. Like getting my bank account details so that money can be siphon out of South America somewhere? But how!