Im tempted to ask trolley attenders this:
"With the worlds attention on the USA elections, does your religion have a preference as to who gets in?"
Of course they will probably reply that they are "neutral in all world political affairs" right ?
Then I would steer the conversation towards whether they should be involved with the United Nations?
You see where I'm going here?
Then steer it toward whether flags are appropriate for Christians to display.
You all see where I'm going here too don't you?
It could make for an interesting conversation!