Sometimes I feel I want to yawn when others yawn. But even with NTs that doesn't happen every time one person yawns, and I have also read that contagious yawning is more likely when a close family member yawns. It also mostly happens with women. It never works on my NT dad or my NT brother when other people yawn in the room.
When somebody's voice goes funny because of a frog in the throat and they don't clear it, I actually clear my own throat, even though my throat is clear. It's like I can feel their discomfort.
When I see somebody has a bit of food round their mouth, I wipe my own mouth.
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Female