Can they top this? As Republican delegates gather again, check out five memorable moments from their past national conventions:
1912: At one of the most tumultuous of GOP gatherings, former President Theodore Roosevelt challenges sitting President William Howard Taft for the nomination. Taft survives, and Roosevelt bolts to start the progressive Bull Moose Party.
1952: With the nomination up in the air, the defeated nominee of 1948, Thomas Dewey, pushes Gen. Dwight Eisenhower for the job. Sen. Everett Dirksen disagrees and angrily assails Dewey, pointing him out on live TV and declaring, "We followed you before, and you took us down the path of defeat!" The delegates decide they like Ike anyway.