Cyclops, Professor X and others in “Days of Future Past”

Cyclops

Kelly's gone, Professor! There must've been more mutants in that gang than we knew about!

Professor X

I don't believe this is the work of the same gang.

Jean Grey

Why not, Professor?

Professor X

Because my watch has stopped.

Cyclops

I don't understand. Why is that important?

Professor X

[drops his watch, which sticks to his chair] Because it's been magnetized.