Distorted text isn't even used in reCAPTCHA all that much anymore -- Google used a Deep Convolutional Neural Network and got over 90% accuracy in reading street numbers in Street View, and 99.8% accuracy in solving distorted text reCAPTCHA (http://arxiv.org/abs/1312.6082).
Most users will just check a "I'm not a robot" box now; and if you do get a test, it will likely be a computer vision / image labeling problem: https://googleonlinesecurity.blogspot.com/2014/12/are-you-ro...