It's extremely unlikely that a useful collision exists. The number of short paragraphs in English which make sense and describe a prediction is much, much smaller than the number of SHA1 values. However, if Quirrel's prediction turns out to be very wordy, or comes in a form other than plain text, your suspicion will be confirmed.
I would like to make a prediction, but I'm not ready to raise the subject of the prediction just yet. So to show that it was not just obvious in hindsight, and to strengthen my precommitment to write an article about it later, here is the sha1sum of my prediction: 9805a0c7bf3690db25e5753e128085c4191f0114.