A Shower Thought being some oddity with the game that occured to you randomly.
As a starting example and one I just had...?
Mr. House, the genius responsible for robotics and the only human smart enough to achieve longevity exceeding 200 years (without resorting to mutations) while single-handedly saving much of Las Vegas from atomic bombs, will offer to pay you 1,000 caps for an object pivotal in allowing him to control the region and - in his own words - save humanity (the Platinum Chip), but will offer 2,000 caps for a common snowglobe.