[djsumdog]

I mean, that's the underlying concept behind the fork bomb isn't it? With ":() { :|:&}" you're essentially redefining the bash noop to be a function that pipes/forks itself into itself recursively.

It's the reason './' is not in the default path as well (so you can't place an 'ls' in your home directory and have the admin run your command instead of the real ls).