I once took off in an old Cessna 140 - on a long runway - when the right side of the cowl popped open at 50'.
For about three seconds I contemplated making a circuit - with the engine likely overheating - and I decided not to risk that. So I cut power, slipped left for a second or two to kill some energy, and easily landed on the remaining runway.
No harm done, except to my ego for accepting the plane with badly worn cowl latches.