Customer called with a superglued Banham rim. They'd tried Superglue solvent but no luck. I said they might end up calling Banham but I'd try if there was a letterbox, no success/no charge (they were just around the corner). There was a letterbox so off I went.
Turned out that the letterbox was protected by a brass chute and a no-go. Gave them the option of calling Banham or having me try to get them inside with a 4mm hole in the door. It was a cold day and they weren't properly dressed so they chose to try the hole. However although the handle was moving OK, it wouldn't unlatch the door. I guessed that glue had made it past the cylinder and into the mechanism.
OK - I'll not charge you then - and you'd better call Banham - which they did. (Banham quoted 60UKP plus VAT to drill out the cylinder plus 90-ish + VAT for replacement; against my 50UKP quote).
Now, said I, you're going to lose the lock anyway, so shall I try melting the superglue to get you in? (They were turning blue with cold by now.)
I hadn't wanted to go that route first off, as I haven't tried torching superglue before, and didn't want to leave them with something worse, like the key getting glued into the lock. It was too cold for the butane in the microtorch to gasify! Maybe it's empty, I thought, I'll just refill it. All I managed to fill was the sleeve of my jacket, which I hadn't taken off. Whoof! Spectacular gout of flame from sleeve on flicking the lighter

No harm done, thankfully, except to my dignity.