Worst design decisions?

The off-topic nanog thread that won't die (where are the topic
police?...never around when you need one)...and then just when you think
it has died, some member's virus infected Microsoft Windows PC (hey is
that redundant?) replies to you with the thread's subject and no body
other than a virus attachment, even though you never replied (on-list) to
the thread.

Whoever you are, do everyone a favor and turn off your PC.

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My vote for worst design decision? Easy. Lookout Virus Express.