title says it all. its true, and kinda weird.
I was in the skingrad two sisters lodge and came accross the Thamriel npc. I asked her about Rumours.
she started to say the routine rumour script that mentions the four high profile thefts that all occurred together. which is actually a reference to Methredhels plan that you assist with by stealing the ice staff in an earlier thieves guild mission. i don't recall her exact words. but, the strangeest thing happened.
her mouth sync stopped and the voice over dropped back to the voice artists real voice (Lynda Carter i think) and said "wait, i'll do that again" then Thamriel repeats the rumour scrpit.

This was obviously an outtake during the voice recoding session, but the mic was left on and the whole piece got recorded. Bad editing there.....

I've heard this particular Rumour script quite a few times, by many different npcs, but never this actual mistake - has anyone else found it, or something similar?

Yup, I've seen this one before. Kinda funny actually. I haven't seen any others like it though.

http://www.uesp.net/wiki/Oblivion:Glitches#Audio_Glitches

There are a few.

Wow thats crazy . I dont think Iv ever heard that happen, Im deffinutly going to look out for it.

Good find. Unfortunately this has been found, by a lot of us some time ago.

A kill-joy if I've ever seen one.

Well, I never knew about it.

I found a http://www.youtube.com/watch?v=3637rDaC5Zc&feature=related that shows the glitch for those that haven't seen it either.