So I have a couple foam swords, because swords are awesome, even foam ones. Of course, they broke quickly under the merciless swordsmanship by my best friend and I. A couple days ago I asked Dad if he could fix my sword, and he put an ink pen inside the sword (in place of the plastic tube that had kept the sword stiff before it broke) and superglued the foam shut. It now works even better than before.
The moral of the story is, as Dad says; "The pen is mightier than the sword."