I actually got all the way to section 13 before I got the .include? error message, in other words, the program had no issues with it before and now that I've gone back and retyped it repeatedly (and even after watching a youtube tutorial) I still don't know what I'm doing wrong... Although I'm sure its likely painfully obvious.
Error message: undefined method `include?' for nil:NilClass
print "test drive. vroom, vroom." user_input = gets.chomp.downcase! if user_input.include? "s" print "SSSS in the house" end