Just write the very first thing that pops in your head. Even if makes no sense or is just a string of random words. Then you have it out of the way.
Pigs love popcorn on Venus. That's the first thing that popped in my mind. Hmmm, that's kind of strange actually. I wonder if that reveals a hidden psychological aspect of myself.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226