answer = ""

loop do

    puts ("\n"*25) #added the closing parenthesis

    puts "How much do you like Star Wars?\n\n"

    puts "A: I love it so much!"

    puts "B: It's alright"

    puts "C: I don't like it"

    puts "D: I live under a rock and don't know what that is"

    print "?: "

    answer = STDIN.gets

    answer.chop!

    if answer !~ /[abcd]/i

        puts "Invaild answer! Press enter to try again..."

        STDIN.gets

    else

        break

    end

end

puts ("\n"*25)

case answer

when /A|a/

    puts "That's awesome! I love it, too!"

when /B|b/ #added the closing slash '/'

    puts "Well maybe you should watch it again."

when /C|c/

    puts "Everyone is entitled to their own opinion..."

else

    puts "Stop what you're doing and go watch it now!"

end