Titanic is of course the obvious choice but I feel even many smaller movies still make me go WTF when I see their adjusted grosses
Rush Hour 2 adjusts to $324 million. A good example
this is old but I think it needs to be reminded now that Chris Pratt hasn't led a non franchise film yet and JLaw seems to be fading starpower wise a bit based on Joy and even the last Hunger Games
Fantastic Beasts would be really successful if it makes 200m. It may take place in the same universe but it is not a Harry Potter movie. It doesn't have Harry Potter or literally any of the characters from the original series. It is a spin off in every sense.
if I had fairy godparents, I would wish that Cameron give up this Avatar stuff and go back to making R rated action movies like Terminator 2, Aliens, and True Lies.