Vaughn Simon wrote:
And if you pull the ejection lever and the canopy STILL stays stubbornly
attached? What then?

The canopy is held onto the aircraft by those explosive bolts. If those
don't remove the canopy's incentive to remain attached, there's not much
you can do about it.

As a bonus, however, the seatback will punch through the canopy first,
and you're wearing that fancy helmet. Worth a shot, at least! :P

TheSmokingGnu