[Sussex] What path does one take

[ar at f2s.com]

> From: "Ian mu" <mu.llamas at gmail.com>
> You can take a machine down as a none privilege user with a
> single shell command.

Pub quiz!

The rules: quotas are set, there are plenty of inodes, exceeding the process
limit kills the parent, symlink dereferences are limited.... the usual stuff.

Your mission is to find:
 (1) the simplest command (least reliant on installed s/w)
 (2) the largest set of techniques we haven't seen before
 (3) the most concise successful Google search

And may the most twisted mind win!

(With so much meat on the list just now what _does_ make trivia irresistible?)