Not feeling you should share some of the stressors in your life ('Yeah, wouldn't I like to have your problems'), awkwardness re: who should pay at a restaurant.
As a crowd gathers things start going badly for the man when a toy town-style mall train drives past, breaking the mood and the embarrassed girl mutters' Oh my god everyone's watching.
If you don't want to sound impolite, or cause embarrassment or distress of any kind to the person you're talking to, you should learn to use tactful and tentative forms in your English.
We all know that silences can be pretty awkward, and research shows that even short disruptions in conversational flow can lead to a sharp rise in distress levels.
Sturm and her colleagues assessed how embarrassing this was for the participants based on facial expressions and physiological markers, such as sweating and heart rate.