... sure it is! The other day I wrote about Viridiana's graduation at UCLA. In Ohio they had the misfortune to get George W. Bush as their commencement speaker (they had voted for Tom Hanks, but he declined).
"[...] Graduating students were told that they would be expelled and arrested if they turned their backs. they were alerted that dozens of staff memebers and police officers would be watching the stands, as well as the Secret Service. A few students asked for the definition of expulsion....did it mean removal from the stadium or refusal of their diplomas, or both? One of the persons at the front said "Both." "
Read more at turn your back on bush.