One scratched one's head when trying to follow the new software update instructions.

When trying to solve the puzzle, one scratches one's head in confusion.

Scratching one's head is a common reaction to a puzzling question.

In unfamiliar company, one pulls one's head in to avoid drawing attention.

When the manager walked in, one pulled one's head in and stopped arguing.

When the CEO entered the room, pulling one's head in quickly became the unwritten rule.

After staying up all night studying for the exams and juggling work emails, my head's a shed and I can't focus on anything.

The seller demanded cash on the barrel-head before handing over the antique clock.

After waking in the dark to a sudden, thunderous noise, she began researching exploding head syndrome and felt both relieved and unsettled by what she learned.

He insisted on cash on the barrel head before he would deliver the goods.