Remember Remember…
Very rare1.7%ObjectiveMissable
Did you really think it wouldn't blow up? Really?
The joke is in the trigger: you've been building up to a gunpowder moment and the trophy wants you to actually let it go off. Follow the powder/fire setup through to the bang rather than defusing or dodging it. Save first if you'd rather not eat the consequences, but you do need the explosion to happen.