When we visited Plitvice Lakes there were hundreds of tourists. At one point we had to wait in line to board a boat and the wait was nearly an hour. Luckily there was a young American couple from California right in front of us. We got to talking and eventually it got around talking about using our phones to translate Croatian into English. We told them of a couple instances where we used Google Translate, just by pointing at a sign and it dynamically translated. In a surprised tone of voice they said, "we didn't know you could just point camera at signs, We learned something!
So we gave them a sticker!