Well, not entirely ridiculous. But right at the top end for this sort of job.
It's role that I've been talking to this company about, with whom I already work, for close to 6 months. Taking the job, if I get it, will be both terrifying and exciting. The actual work is 100% in my wheelhouse, but it's a long time since I've have had this sort of traditional corporate job (I've been consulting, freelance, for years now).
I'm fully awre that if they give me the salary, it's right at the top end of what is considered acceptable for a role like this. But I have strong reasons for wanting that pay: as a consultant, I earn a good salary on a per day basis; I have excellent experience; there's quite a lot of risk for me in taking this job and giving up my consulting role; when I left the corporate world almost 15 years ago, I was earning about 2/3 of what I'm asking for now.
I'm just completely gobsmacked I managed to do it. I've known this conversation has to happen for a while so I wasn't unprepared, but traditionally, I've been hugely underpaid. So I'm really really proud of myself for saying what I actually want.
Of course, there's a chance they'll tell me "get lost" now! 
But it's a risk I felt I had to take as if I didn't get this salary, the reality is that I'd not be able to take the job.
Is it just me who feels like this when asking for significant pay? I'm literally still completely in shock.