GallagherComedian Gallagher was hospitalized after collapsing during a performance in Minnesota.

TMZ is reporting that Gallagher, whose real name is Leo Anthony Gallagher, was performing in Rochester, Minn., when all of a sudden the comedian was seen collapsing on to his back and clutching his chest.

A number of witnesses said that Gallagher was performing his famous "sledge-o-matic" routine -- where Gallagher smashes watermelons with a sledgehammer -- when he fell backward onto the stage. It is reported that his eyes were closed and he was visibly shaking.