The congratulations offered by the comedian Patton Oswalt to Brian Corman, the Columbia University 2010 School of General Studies valedictorian, in a Twitter message on Tuesday were hardly heartfelt. The message linked to an online video showing that Mr. Corman’s valedictory speech had appropriated material from Mr. Oswalt’s stand-up routine. The Twitter message drew an apology from the student and a statement by the university that it was “deeply distressed.” On his Twitter account Mr. Oswalt, right, a star of “The King of Queens” and “Ratatouille,” wrote: “Congrats to Columbia University valedictorian Brian Corman! Great speech.”