How would you react if your bf did this?

You have a great evening out, and you get home, both are quite tired and its late. You can feel the chemistry your burning up. Then as you ask "What shall we do next then?" full of anticipation and your bf, puts on a face with a straight expression (lips dead straight), eyes wide open and glaring at you but totally empty, his entire body language just is still and straight (arms relaxed at each side of the body, not crossed etc..) and says "..." then just stares at you for one minute, saying nothing else. What would you do? How would you feel?