I took a lighter to the back because part of the melted pen stuck into the grooves of the screw, and I couldn't get them out, so I thought I could melt the pen cap, only to make the back of the cartridge even worse (I wasn't thinking, OK?). I couldn't get the game apart because of it, so I slammed it onto my kitchen floor a few times until it broke apart. Unfortunately, that caused a couple pieces of the shell to break off, so I couldn't put it back together anyway, burnt back or not. Then I just said 'fuck it' and took a lighter to the shells and smashed them with a meat tenderizer, to avoid the temptation of digging it back out of the trash in regret, knowing me, even though I knew it was beyond repair, and I didn't think GameStop or Vintage Stock or whoever would take it with a burnt back. They might have and could've replaced it, but oh well. It's too late now.
Sorry for the repeat.
And yes, I broke one of my first Gamecube controllers once playing Super Smash Brothers Melee... Let's just say those last few Event matches were a pain in the ass!