Latex: \bibtexstyle{dinat}, urls and obscure errors

I was trying to use the bibtex style dinat, and kept getting

/paper.bbl:31: Illegal parameter number in definition of \Hy@tempa.
<to be read again>
                   K
l.31

in my .bib file:

@Electronic{ WPRTV,
        author = "Wikipedia",
        title = "Reality TV",
        year = "2008",
        month = "Nov",
        url = "http://de.wikipedia.org/w/index.php?title=Reality_TV&oldid=52629683#Kritik"
}

So, something chokes on the ‚#Kritik‘ part, which is a legal URI. Remove or escape the # with \, and everything works.

Friend of mine tells me that this has been happening to him before, so it's probably a general problem of Latex handling URIs? I was using \bibstyle{alpha} before, which wasn't showing the URI in the first place.

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