The twin passions in the life of Ryan Leli intersected last August when the San Diego Padres came to Shea Stadium to play the New York Mets.

Mr. Leli, 18, had worshiped the Mets since age 3 and was a huge fan of Mike Piazza, the catcher, even after he left the Mets a year ago for San Diego.

Mr. Leli’s other passion was celebrity-chasing. A drama student, he relied on sharp clothes, acting skills and general charm to infiltrate movie sets and film premieres, meeting the likes of Tom Cruise and Sean Combs. He would post photographs of himself with the stars on his personal page on MySpace.com.

So that August afternoon, Mr. Leli did what any overenthusiastic Piazza fan might fantasize about: He created a fake press pass that fooled Shea officials and gained access to the visiting team’s clubhouse, where Mr. Piazza was being interviewed by a scrum of reporters. Mr. Leli’s line of questioning — especially the request that Mr. Piazza pose for a photo with him — annoyed a Padres official, who had him ejected.