This is the second time since December that we have gotten toys for our kids and when I unpack them, the "cord" that is used to secure them into/onto the plastic backing has been fuse material.
This time it was only plastic coated gray paper, but the one at Christmas was fully charged firecracker fuse. Yes fuse, with wax and smokeless black powder. My wife did not be leave me until I took her out side and lite it. When it started shooting off sparks as it burned she was very surprised.