The Inbetweeners star was invited to read for a part in the comedy character's big screen debut, Alan Partridge: Alpha Papa, which opened at the top of the U.K. box office last weekend (09-11Aug13).
However, the read-through proved too much for Buckley, who is a huge fan of Coogan's work.
Telling fans of his embarrassing time in front of the film's producers, the star writes in a post on Twitter.com, "I read for a part in Alpha Papa. Embarrassingly I'm such a Coogan geek I was literally starstruck of the script (sic). Was V (very) nervous, I wasn't cast."
The film co-stars Sean Pertwee and Colm Meaney.