What is something unrealistic that you often see in movies that annoys the hell out of you?

Daniel Inouye would like a word:

As his squad distracted the third machine gunner, Lt. Inouye crawled toward the final bunker, coming within 10 yards. As he raised himself on his left elbow and cocked his right arm to throw his last hand grenade, a German soldier saw Inouye and fired a 30mm Schiessbecher antipersonnel rifle grenade from inside the bunker, which struck Inouye directly on his right elbow. The high explosive grenade failed to detonate, saving Lt. Inouye from instant death but amputating most of his right arm at the elbow (except for a few tendons and a flap of skin) via blunt force trauma. Despite this gruesome injury, Lt. Inouye was again saved from likely death due to the blunt, low-velocity grenade tearing the nerves in his arm unevenly and incompletely, which involuntarily squeezed the grenade tightly via a reflex arc instead of going limp and dropping it at Inouye's feet. However, this still left him crippled, in terrible pain, under fire with minimal cover and staring at a live grenade "clenched in a fist that suddenly didn't belong to me anymore."[13]

Inouye's horrified soldiers moved to his aid, but he shouted for them to keep back out of fear his severed fist would involuntarily relax and drop the grenade. As the German inside the bunker began hastily reloading his rifle with regular full metal jacket ammunition (replacing the wood-tipped rounds used to propel rifle grenades), Inouye quickly pried the live hand grenade from his useless right hand and transferred it to his left. The German soldier had just finished reloading and was aiming his rifle to finish him off when Lt. Inouye threw his grenade through the narrow firing slit, killing the German. Stumbling to his feet with the remnants of his right arm hanging grotesquely at his side and his Thompson in his off-hand, braced against his hip, Lt. Inouye continued forward, killing at least one more German before suffering his fifth and final wound of the day (in his left leg), which finally halted his one-man assault for good and sent him tumbling unconscious to the bottom of the ridge. He awoke to see the worried men of his platoon hovering over him. His only comment before being carried away was to gruffly order them back to their positions, saying "Nobody called off the war!"[14]

/r/AskReddit Thread