Crawling around few corners of the net I've found a file named something like do not uncompress me unless you're a bot dot gz. It is, as per extension, a small gzipped file (26 kBytes), but — and this explains the suggestion — it expands into a 10 GBytes long files.
A sort of modest zip bomb, but for gzip.
You can find more on
Beware, those files can be dangerous if not handled properly! Do whatever you want at your own risk. Be safe.