Question: Who is the guy sitting alone on a picnic table in the school courtyard while the girls are singing "Summer Nights"?
Answer: The guy on the table that was just at looking out at the end of "Summer Nights" was John Travolta's brother he was just an extra.
Travolta has 2 older brothers, Sam and Joey, who are also actors and have been involved in the industry. The guy sitting on the table near the end of the song is neither Sam nor Joey.
Answer: I think a school teacher.
Answer: Danny.
Can't be Danny since he was also singing the same song on the bleachers with the guys.
It was John Travolta's brother he was just an extra.
Answer: This man is the high school's kitchen staff. He's wearing a blue shirt, beige trousers, and a white apron. All during this lunch scene we can see him in the background in a few shots, while he's collecting students' trays, etc., even before they start singing "Summer Nights." (00:11:15).
Super Grover ★
Thank you SO much for this answer! I have recently gone back and looked at the scene, and sure enough - he's a cafeteria worker. What he's doing sitting on the table in the "thinker" pose at the end of "Summer Nights" is another question, altogether. But at least you've answered my question as to who the heck is.
Michael Albert
The Summer Nights scene shows the progression of their lunch - at the end everyone has gone except the pink ladies + classmates. He's probably waiting for them to go so he can clear up, you see him resume work as the girls leave.