After having so many bugs in the 6.67c. Kuarinofu has just found another bug in DotA 6.67c in which Roshan won't attack you if you use Morphling's Waveform on it. It is pretty weird bug with Roshan's Artificial Intelligence though not game-breaking. However, you can still abuse this bug for fun. Check the video and guide of performing this Roshan Bug.
• Pick Morphling
• Get a Flying Courier.
• Send both to the Roshan's place.
• Scout his area using Flying Courier.
• Now use Morphling's Waveform on Roshan and click attack while in Waveform.
• Roshan will not attack you anymore :)
Dota 6.67c Linken Sphere Bug
Puck Invulnerability Pug 6.67c