জীবন্ত openings & endings that had too many spoilers.

When either the lyrics অথবা the অ্যানিমেশন gives away things about the plot that are supposed to be revealed over time, killing any suspense অথবা curiosity.

Example: Travel way back in time to 1995. The whole plot of the first season of Sailor Moon was discovering new scouts & finding that damned princess. The opening theme told & showed us the identity of absolutely everyone before the first episode even started. Admittedly the Japanese theme also gave away the scouts, but they kept the mask on Tuxido Kamen & left out the princess.