My solution, which is probably pretty similar to everyone else's
solution, but I didn't feel like being creative this weekend:

1.upto(100) do |i|
   puts case i % 15
      when 0 then "FizzBuzz"
      when 5, 10 then "Buzz"
      when 3, 6, 9, 12 then "Fizz"
      else i
   end
end