Last September, I was not actively searching for a new job, but came across a post for a position at Twitter, and couldn't skip the opportunity to apply.
I decided to get fancy and compose my cover letter for the position in tweets-140 character installments. I grabbed Twitter's background (this was pre-"New Twitter") to create the work of art below, and even ensured that each of the hyperlinks worked.
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I was proud of it, but Twitter was apparently unimpressed, because I never heard back. Maybe that's why I'm account service and not creative.