assuming you have windows...
open the replay in notepad (C:\games\toribash-x.xx\replays\)
right click on the replay file
"open with", find notepad, and open it with that.
you'll see a few lines like this (I just picked one of my replays but it'll be pretty similar to anyone else's):
#!/usr/bin/toribash
#made with toribash-4.3
#SCORE 371462 -5330
#WIN 0 chrisfinne
VERSION 10
FIGHTNAME 0; chrisfinne_Don't
BOUT 0; chrisfinne
BOUT 1; chrisfinne
AUTHOR 0; chrisfinne
NEWGAME 0;500 10 15 0 0 2 100 0 0 classic 0 0 100 0 0 0 1 0 2 0 0 0 0 0 0 0.000000 0.000000 -9.820000 1 0 0
FRAME 0; 0 0 0 0
change both the emboldened lines' names' with your name (one will say uke)
save the file
open normally with toribash and you'll be permanently fighting yourself unless you change it back.
--
damn ninja^