fizzbuzz.rb

  (1..100).each do |each|
    if each % 3 == 0 and each % 5 == 0  
      puts "FizzBuzz"
    elsif each % 3 == 0 
      puts "Fizz"
    elsif each % 5 == 0 
      puts "Buzz"
    else
      puts each
    end
  end  

The variable name each kind of suggests the wrong thing. It's like saying:

people.all do |all|
  if all.age > 50
    puts "damn, you're old!"
  else
    puts "ok, go ahead"
  end
end

By naming the variable all I'm making it sound like we're checking all the ages every time.