BILLINGS, Mont. — A high school student’s appearance behind President Trump at a Montana campaign rally caused a social media stir on Friday after the 17-year-old made a series of facial expressions that looked a lot like, well, a teenager reacting to a rambling politician in a suit.

Internet users were quick to ascribe meaning to the student’s raised eyebrows, his knowing smiles and pursed lips, variously interpreting the looks as disbelief, disinterest or hostility toward Trump.

The Billings Gazette identified him as Tyler Linfesty, a senior at Billings’ West High School.