Putting the last piece in a 1000 (or more) piece puzzle.
Taking the last part of a model from the sprue and attaching it to the model.
Filling in the last square of the Saturday Crossword Puzzle.
Getting the last number of a Sudoku puzzle.
Taking off your skates or ski boots after a long day on the ice or the mountain.
Planting the last artificial tree on the train layout.
Getting the last colour in the Rubik;s Cube
Acquiring that last country in Risk.
Conquering the last civilization in Age of Empires
Getting the last card for your set.
The Stanley Cup Championship game.
The last train stop on the journey.
Writing the last postcard of your vacation.
The match winning tennis shot (forehand, crosscourt lots of topspin)
The last ski run of the day.
Watching the last episode in a TV series you’ve enjoyed.
The last piece of birthday cake.
Drinking the last beer.