I seem to recall an F4 out of CY which lost a wing outboard of the fold mechanism. They flew it around for a while and even slowed for a slow speed handling check to see if it might be possible to land it. Then the duty pilot in the tower suggested they see how it handled with the flaps down - which, being naive types, they did.
Loss of hydraulics was swiftly followed by a double ejection.......
Don't know about the F4 getting airborne with wings folded, but it happened several times in the Crusader. One pilot unloaded the aircraft and locked them down in the air, a second flew an abbreviated circuit and landed - wheels up. Obviously not his day.