Jason Roe, Irish freelance web designer/developer, was poking around on Ryanair’s website when he found an interesting usability bug which “allowed users to obtain a 0.00 charge for their flights.”
In short, Roe found a trick to fly for free.
Roe was quick to point out that he did not complete any transactions at the steep cost of £0.00, but did think it was relevant that someone from Ryanair should know of the error and perhaps even work to rectify the problem.
The response he received from Ryanair was unbelievably bizarre, and incredibly, brazenly, rude:
jason!
you’re an idiot and a liar!! fact is!
you’ve opened one session then another and requested a page meant for a different session, you are so stupid you dont even know how you did it!…
It goes on like this. Check out the full post, replete with shameless Ryanair comments: at http://www.jason-roe.com/blog/free-ryanair-free-flight-bug/.

The full story at Jason Roe:
http://www.jason-roe.com/blog/free-ryanair-free-flight-bug/