Do not try this at home.
I could not get the top off a previously opened tube of superglue, err it was glued shut. I could feel that there was fluid in the tube, but how to get it out?
Cuttng the tube with scissors seemed a good idea. Do that, get a blob of glue, do the repair and throw the tube bits in the bin - job done, so that's what I did.
I have just been to use the scissors to get into the new three-pack of superglue tubes and the blades are stuck.... solid. Oh, the irony is killing me.