The question mark is usually put after a movie that the person hasn't yet agreed to watch. Once they've confirmed that they've never seen it and will be watching it, the question mark usually goes away.

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Movie Reviews | Anime Reviews
Top 100 Action Movie Countdown (2015): List | Thread
"Well, at least your intentions behind the UTTERLY DEVASTATING FAULTS IN YOUR LOGIC are good." - Captain Steel
Movie Reviews | Anime Reviews
Top 100 Action Movie Countdown (2015): List | Thread
"Well, at least your intentions behind the UTTERLY DEVASTATING FAULTS IN YOUR LOGIC are good." - Captain Steel