Hard-working student

There was a very hardworking student who was preparing for his 12th board exams as well as other competitive exams. He used to slog day and night working out problems. One day, he was working on problems of limits, continuity, etc. As night approached, as he worked out limits, the spacing between LIM when he wrote limits kept on increasing and also their size. Why?

Because he was "stretching his limits".