And yet, Asgardian weaponry is so cool, futuristic, and kick-ass that we've only got to assume Odin picked it up at Galactus's garage sale. Witness, for example, the Asgardian Frost Gun!
(Click picture to zoom in on the big-ass icemaker gun)
Wow, that thing even looks like it was sized for Galactus's big purple-gauntleted paw, doesn't it? Thor and company has pulled this thing out of Odin's gun locker to battle against gigantic fire demon Surtur, whose arrival signals Ragnarok, as does every other event in Asgard, including the time Thor played his CD of "Carmina Burana" at volume level 11 and when Volstagg's pizza arrived later than thirty minutes after he ordered it.
Needless to say, it doesn't work and everybody is burnt to a crisp and dies except Thor who was apparently hiding behind a rock.
The Asgardian Frost Gun! Maybe they should have charged it overnight first.