Well, closest thing coming to that is a sort of small entryway, with something explody on one side backed against a hard surface, and a lot of stuff between it and the only exit out. Now if that explody thing happened to explode, well, all that stuff would come out, see, and Karnage see's that and he's like "That's cool! But how can we do that again..." And so he makes a cannon. Than Lucilia see's it and she's like "Compensating for something? It needs to be more compact..." And so and and so forth.