1: freeze a frame in an animated gif
2: unzip a .docx to find dirtbags file
3: embedded in comment in .docx
10: pngtopbm -alpha file.png
20: after JPEG footer
30: dd if=whatever bs=16 skip=1 | zcat
40: low-order bits
100: Canon.0x0018
200: filename of each gzip part