Bash is the default shell in many Linux distributions. People, especially clueless Windows promoters, often argue that you cannot use Linux without a terminal. While this has been wrong for a while, many Linux people love hacking the command line.
One command you should not try is a fork bomb, unless you're doing it for science. This somewhat cryptic form of a fork bomb in Bash fits nicely on a shirt and is guaranteed to get some attention.
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