[slobotron]

There was a bug in Windows 95 (98 too?) where if you tried to open 'nul\nul' or 'con\con' etc, it would BSOD instantly. Provided lots of drive-by fun in computer labs... (got really good at typing win+r con\con)

[tonyarkles]

For more fun, you could also target other machines with SMB shares. \\thevictim\foo\nul\nul would BSOD that machine. Good times.

[cesarb]

IIRC, you could also reference it in a HTML page, so the whole computer would crash when that page was viewed.

[johnfn]

This is like the 90s era "undefined is not a function."

null is not a problem, but null.null, on the other hand...