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I think he accidentally the whole thing [1].

It is deliberate, dropping the verb after 'accidentally' is a long running joke. See http://knowyourmeme.com/memes/i-accidentally

Like numerous other memes, this too originates from 4chan. A poster on /b/ back in 2008 wrote:

"I accidentally 93MB of .rar files” and the rest is history.

wow. so people are this ignorant of memes. you must be incredibly productive.

All your base are belong to us.

Sometimes typos lead to memes.

Sometimes memes lead to people learning incorrect grammar (as I beat down my former benevolent grammar dictator within).