Perhaps you can notice what they are doing at the moment and make a polite comment about it as you initiate a conversation.
أَوْ يُمْكِنُنَا أَنْ نَرَى مَا يَفْعَلُونَهُ كَيْ نَسْتَهِلَّ ٱلْمُحَادَثَةَ بِتَعْلِيقٍ لَطِيفٍ .‏