Well lets see, many a year ago when I was a wee little lass, I was working on a 1/32 F-4 from Revell, and I couldn't get the wing joint to glue so I had to put down a crap ton of putty on there, and got to sanding well dang if I didn't put a hole right in the wing box. Well I thought I know what to do the second time around and guess what....
While working on a C-17 at work, I taped off the engines and had them lieing on a workbench all taped up, someone asked me what they were, I told them they were my engines for my model. The next day I go to look for said engines, and lo-and behold, they were thrown out by my co-worker, there goes another 40 bucks. The moral of this one is don't let engines out of your sight.
Working on a B-52 in 1/144th scale and I started using the model master scribing tool. While the tool worked perfectly, I took to much out of the panels and it looks like the panels are just wrong.