Itsy bitsy free spring rolls

I had lunch at Pho Cyclo today, and I guess the guy forgot to put my order into the computer, because after everyone who got there after me got their food, they came over with some free spring rolls, apologized for the delay, and asked me what I had originally ordered. That was certainly nice of them. Another time I had this happen to me there, they gave me the sandwich that I had ordered to take with me to work for free. 

And they played Itsy Bitsy Teeny Weeny Yellow Polka Dot Bikini. I think that's the fourth vietnamese restaurant I've heard that song in. What's the deal?