Few minutes ago, I clicked the last page in the Stack Exchange Network Leaderboard:
Just to be greeted with an empty and sad page:
Manually going to the previous page (2186 at the time) showed exactly 20 items in there.
Since that leaderboard is always expanding, I found another site, low traffic which currently have 40 users with hat, and it's indeed reproduced in there: Tor Leaderboard. While it contains only 40 users with hats, it's showing as if there are 3 pages:
And clicking page 3 leads to the empty page.