Jesus. Fucking. Christ.pic.twitter.com/QjmTJF6pPb
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Okay! That's reasonable. It can be tricky, though, I admit. Something can start out good, but then get terrible halfway through, or end on a really poor note...or it could start out terrible, but then get MUCH better.
It is kind of self-defeating though. 95% of the people who click that video will never make it to the end, so the longer your video is the more time and material you're wasting. Even fans will pause the video with the intention of going back to it, and just forget.
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