"It's nice to see the Seersucker still in use. It looks great on you."
"I like seeing someone with the boldness to do a crossword in pen."
"You know, even though you have removed the dust jacket, people can still see that you are reading Harry Potter. It's a great book, but you should have the confidence to just read it."
Interestingly, there are things that should probably be said but aren't. For instance, yesterday, the person behind me in a crowded car probably should have said,
"What do you have in that backpack, bricks? Did you know that if you take if off your shoulders and put it on the floor, it will save space and also not hit me in the face when the driver brakes."
And then there are the things that are fun to say, but aren't said much. When I used the urban rail system more for transit and less for pure commuter purposes, I ran into a lot more tourists who didn't know much about the system. One could be kind to them, and it was often worth doing, but sometimes they were oblivious enough that it took a loud
"Walk on the left!"
to get them to gather up their selves and children and bags and other obstructions and let people through.
Another favorite category of mine are the things that are said by body language, specifically, the exercise of force or momentum. For instance, if a group of people are standing in the train's doorway, and have seen you make maneuvers to get to the door, you could say,
"Pardon me, but I need to get off at this stop. Would you please step out for a moment? You can get right back on when I have exited."
Or you could just lower your shoulder and take them with you. The talking way risks miscommunication or the need for further negotiation and convincing of the possibility of your getting off, all of which takes time which you and those behind you may not have before the doors snap shut. The keep-moving way is a sure thing (even for a little guy like myself - just yesterday I ran into a guy who weighed about half again what I do and had about 8 inches on me, and who was walking directly at me, but I hit him a little off center, and he spun out of the way like a shrub off a truck's brush guard). Besides, the looks on their faces is priceless.