Whenever I've tried to paste large blocks of code (whole classes, long code snippets, etc.), I'm always greeted by this message for each line of code inputted:
Display all 3616 possibilities? (y or n)
I'm pretty sure it's because my code is indented and it's triggering the tab functionality by pasting the tab character. If this was just a visual annoyance, I wouldn't care, but it tends to randomly stop processing lines in the middle of a method and then demands that I type y or n.