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1. 500
The error code returned when an HTTP "Internal Server Error" occurs.

Often occurs when a CGI script running on a server encounters an error, and the scripting engine does not produce an error page of its own to explain the problem in detail.
HTTP 500 - Internal Server Error
2. Highly Trained Monkeys
Youtube's 500 Internal Server Error Message.

Full message below:
500 Internal Server Error

Sorry, something went wrong.

A team of highly trained monkeys has been dispatched to deal with this situation.
Also, please include the following information in your error report:
kWY4uJ_NrEguCir1hsLFYgUIfRFflX6os57U2m_qKY9cN8cUCo_MtdStTfeG c2Tb9tmweAdPLdN_2UiOzplOwAF3QzYOZvLxOO-KB5470bQ-TU84fIp7br2A EVPaOwSrcBxMlXDZhLEogP1mluxo-OQZJDR8j93OcfiMADB5agJopCIDxMp1 E3fuXjh-l5WNR8HorfvB4IjHnbRUKve3J7ZMdRs_uXoVFf35athVo5qBN1bC y5Keje5t5dyku2XsuqdsGr5c7U9L1IUgzQIZDPV7FusFcDe5rGilt8XTolk7 QlX5rf-Zv3OZUJMUJ-gSUguCDOstSe2D-TdQAqe_Rrwa8IxAmMRURgSIMBKZ LGTLqAnZi4w9kB9nzt6ZRv3ANlxhsBmftSwFG6FnPf8hzb5mqdsiVnDh7x33 Cjfs6gAdcPNd9O7wHJL5fsvStlbQW92ajBjcRgFWazoZ5iTBKukNafMbmrsa cfbCP9m77ktxD4OHNeqnvIDh-4wVYqeF8J7JKuPbaPWG4eWDxVoixjVbiof2

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3. gtaforums
HTTP-500 Internal Server Error
Gtaforums is well known for it's stupid, and utterly annoying, HTTP-500 Internal Server Errors.
4. donque
Another meaning for 500 Internal Server Error
"Shit James, I just got a freakin Donque, ugh stupid site."
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