[syrrim]

Why not? There are many strange facts in the world. Some of them are even true. It is very difficult, when recalling a strange facts, to remember whether it was one of the true ones or not. So naturally, things we've heard will tend to exert a pull, even if we later found out they were wrong.

[dlkf]

In virtue of the experimental design, you were just now told that the "strange fact" is bullshit. If you had a clear opinion prior to receiving the strange fact, you'd revert to it