Swing-up canopy not shut in high-speed flight, what would happen? What would happen to a canopy like that on the Eurofighter Typhoon that swings up if it wasn't shut properly and the plane was going at high speeds, would the canopy blow back open?
(Source) T-38 Talon

Yes, it's possible. If it didn't separate, then it needs to be checked after the scary and cold flight is completed.

There will be warnings if the canopy is not closed shut.



(T-38 Talon Pilot's Flight Operating Instructions)