realizing what tense a story is written in.

Sometimes, when reading a story, something will happen that jogs me out of the immersion. Be it an egregious spelling error, a line break, a particularly dumb line of dialogue, or, in the case of the amazing story "like fine wine" by sleeplessbrony, a semi-flashback.
When I am no longer fully immersed, which is usually my fault and not the author's, I notice the structure of a story. In this case, I noticed that the story I had been reading was in fact written in present tense. It's pretty weird to think "wait, why did it change from past to present?" Then I looked back and I realized, "No, it was always present."

No point here, just a weird thing that happens to me.