Right before the final aliyah today (Parshat Pekudei) the gabbai asked everyone to stand up. He does this before the final aliyah of each of the books of the Torah. While I have seen discussions about standing during leining in general, or standing for the 10 hadibrot, I can't find any source or (more importantly) reason for one to stand specifically for the last aliyah of the sefer.
as per comments: apparently in some places, the people are asked to stand (via a klopp or something else) just for the last pasuk. Asking before the aliyah would avoid an interruption at that point.
Why is this aliyah (or this pasuk) different from other aliyot in that people are asked to stand?