lol my biggest mistake was installing a spoiler on my best friend's 97 mustang. There are holes in the underside of the trunk lid where you drill for the screws. BUT there are 2 on each side.. One is the correct placement, and the other..well i dont know why its there. But anyways, I drilled the first hole right in place and everything. I went and lined up the other hole but when I went to look at the placement on the underside of the trunk lid, I accidentally picked the WRONG HOLE and drilled right through... Oooo shit.. So after realizing all that, I installed the spoiler and went back to the screw hole. For the time being, I just put a stainless screw in and sealed it with silicone. I later gave her the money to fix it but GOD I cannot believe I did that. It was just a slip of the eye I guess. Luckily, it was my best friend and we can laugh about it today.. She doesnt hate me cuz the whole car needs a paint job so one more spot on her car just isnt a big deal lol.