What: “Lousy bony fingers!” bronze trophy
When: During Year One (beginning of the game)
Where: El Marrow, streets
Once you leave the Department of Death, you'll be in front of the building. Head off to the lower right to change screens, where you can see a huge parade happening off in the distance. If you head towards it, you'll find that there are tents set up preventing you from going further. You'll find a skeleton clown playing with balloons here. If you talk to him and inquire about learning how to twist balloons. After some witty responses back and forth, the option, "BANG!" will appear as a choice. If you choose that, he will pop the balloon he was working on. After ending the conversation with him, you will earn this trophy.
This trophy is missable. If you do not get this before you leave El Marrow, you will be unable to get it further through the main playthrough (and thus, have to start a new game over just for this and any others you might have missed).