From a Washington Post's article about Columbine HS:
A similar event happened at a Columbine wrestling match at Arvada High School. Pyne, "in front of everyone," said Harwick, broadcast to all within earshot: " 'Her breasts are getting bigger.' They're laughing -- the jocks were." She told Coach Place; he told her to sit on the other side of the gym.
She then went to a woman at a concession stand, who called the Arvada police. The officer issued Pyne a ticket. Because he was a juvenile, court records are not available, but Harwick said he pleaded guilty and paid a $50 fine.
While it's obviously in poor taste, I'm surprised that a comment like "Her breasts are getting bigger" is actually illegal. What laws were being broken, and might not such speech be protected by the Constitution?