The last is always the best, especially for chocolates after researchers from the University of Michigan found that people enjoy the last piece of chocolate

When the researchers handed over the last piece of chocolate, they told the students, “Here’s the last one.” The last chocolate was rated as being the best.
"It's also possible that we have become used to expecting endings to be happy. When you simply tell people something is the last, they may like that thing more," Ed O’Brien, the study leader, told the Daily Telegraph.
Source-Medindia