Shouting Man at the Funicular in Budapest

I know that it sounds weird, but the thing is this: according to some tourists, there is a pushy guy who is trying to force his tourist guide services upon you - usually at the Funicular railway near the Tunnel (at the foot of the Castle Hill) in Budapest. He seems to be harmless though, and may be just nuts: if you walk away he may feel that you remain in darkness without his guidance. Don't worry about him - there are crazy people everywhere, why would be Budapest's 2 million people an exception? And the whole thing just may be a mountain out of a molehill.

Now here is what Ms P76 from London asked on TripAdvisor:

Has anyone else experienced this rather strange man offering tours outside the funicular? He goes on and on about offering you a guided tour and becomes very agitated if you try and interupt him, and when you do have enough and walk away he shouts after you "you know nothing, you know less than nothing!"