Hungry Ziad Tayeh’s death knife may not have been the only serious cutlery at a fatally popular Midtown falafel stand, a Manhattan jury learned yesterday.

In fact, both sides in a deadly cutting-in-line argument may have been packing knives — and not the disposable plastic ones, according to an eyewitness’ dramatic testimony.

The testimony bolster’s Tayeh’s self-defense claim in the bizarre manslaughter case; he’s charged with thrusting a punch knife into the heart of another man after a fight sparked by the victim’s cutting to the front of the long line at Halal Chicken and Gyro at 53rd Street and Sixth Avenue in 2006.

Yesterday’s proceedings were stalled when the mother of victim Tyrone Noel Gibbons, 19, collapsed during autopsy testimony.