Here's another one...
IZZIE: [to Richard] "I cut the LVAT wire."
MEREDITH: "Actually, I cut the LVAT wire."
GEORGE: "No, I did. I'm the one who cut the wire." [pauses, elbows Christina]
CRISTINA: "Fine, I cut the LVAT wire."
ALEX: "I didn't do anything, I'm totally innocent."