Option 1: when somebody’s subject line is short and undescriptive, giving you absolutely no idea what the post contains.
Ex. “LOL!” or “This is great”
Option 2: The poster could fit the entirety of their post in the subject line if they wanted, but they don’t because they want you to click their post. Bonus points if the only thing in the post is an emoji.
If you find neither behavior annoying, don’t vote.