TA

When I was working at the Brest Cancer Research Shop, one customer said to me TA.
What is TA???
TA seemed not a word but just some sound.
My colleague told me that TA is the Abbreviation of “Thank you”.
Nobody can imagine the TA can mean “Thank you”, can’t they! I am watching BBC every morning but they have never said TA.
I think this must me the real conversation and I need to learn on by one.
I learnt two more things. When one customer bought a Video tape and said “ Anything good?”. I though he was asking us if there was more nice video tapes in the shop. I thought if he wanted to check, he could see the video tapes on the selves by himself.
My colleague told me that he was asking us if video he was buying is worth to see or not. How can the sentence “anything good” can meant that!!
My colleague answered to him “it is must”. I though that she recommended the video saying it is a nice video and he must see it. But in really to she meant that he must see the video to judge it is nice or not.
Still I could not understand well.