Welcome to the country, the only place on the Internet to misstate the country's real name. This is what's going on. Some English beginners who are not used to be thanked in English will probably translate Indonesia's phrases word for word into English to reply. If an Indonesian expresses gratitude by saying "terima kasih, (thank you ) the reply commonly is " kembali" (come back which actual meaning is I thank you in return for thanking me)
Is it tickling to you? One thing for sure, you don't have to come back when you happen to be in this situation, OK? Just smile and forget it.

Hi, nice to know you. I hope you like the way I look. How's about life? Have you had yourself well-shaven. Well, I have to go now. I'll talk to you later about life, okay? Oh, if you need me just call 911, I won't be there. Ha-ha-ha. Not funny, is it?

Something in the dark. Is it evil? You bet!

Beware of black magic. I used to be the one hit by. No kidding. Don't believe in illogical things? Better not until you prove it yourself.