Sorry to post on an old thread.
I have occasionally if my uncle experienced a kind of 'time-slip'.
He lives in the house his parents owned, (I lived there too, when younger). At the time his mother, (my Nan) was alive, although his father had been dead about ten or twelve years at this time.
He was studying pretty intensively for a degree, which I only mention to show that his mind was in a state of concentration (it was Pure Maths, so not the kind of subject matter which would set the mind on an imaginative flight, or it would not set mine on that path).
There was, he said, no-one in the house, no t.v. or radio on, as he liked it to study when there were no distractions.
The house is detached and fronts a small 'b' road (it's a very rural area) so very little noise filters in save the wind in the trees and the odd bit of traffic.
Anyhow, he had been studying for some time, when he heard, very clearly, his father talking from the next room, and my uncle, half-listening, didn't think there was anything odd in it. He said he just registered that it was his father talking as if in conversation with some-one. (And not to him). He couldn't hear any-one else. Then, as he realized that this couldn't be happening, his father's voice faded.
He was not, apparently, afraid, although he didn't term it as such, now I would call his reaction a WTF?
There's no history of the house being haunted; it's always had a very peaceful atmosphere, so this is why I posted this account on here, rather than under a 'ghost' thread. It seems as if somehow my uncle was hearing the 'past', rather than a ghostly voice, or the house itself was playing back something it 'recorded'.
I have heard of audible time-slips, the bombing of Dieppe (I think), among others. This is much less spectacular, but along the same lines, maybe.