"last night at the e6 holiday surprise tour show in nyc (best show EVER???) mr jeff mangum came out and sung on 3 songs!!! (2 olivia tremor songs and an elf power song) then after the concert my gf and i got to meet the guy! in fucking person and he was nice and smilling and the whole 9 yards."
there is also an article about it here
it's kind of insane. i'm so jealous of this person right now.
the person who posted that said he is going to upload pictures from the show also
pictures are here