Some lingering questions we have after watching this guy throw a grenade into an ATM

Good morning. Ever wondered what would happen if you put a live grenade inside an ATM in the middle of the desert? Here is a video of a man throwing a live M67 frag grenade into an ATM machine in the desert to see what would happen. Spoiler Alert: What you think would happen, happens.
Okay. Hi, hello. Welcome back. First, some background: This 10-minute video comes courtesy of YouTuber Edwin Sarkissian, who appears to mainly upload weapons testings clips, such as seeing how many iPads (and footballs, and pumpkins, and hams) it takes to stop a crossbow bolt, firing a Beretta 81 at a bunch of Payday candy bars, and launching a bowling ball cannon from the seat of a PT Cruiser. Like putting a grenade in an ATM, they all go about how you expect. And yet, after watching this clip of a man throwing a grenade into an ATM, we would like to posit the following questions.
What the fuck?
What the fuck, man? How could anyone think this would be a good idea, especially under the conditions shown in the video? This guy seriously just drops a live grenade into an ATM and runs as far away as he could before it explodes? Did he really think running thirty feet and laying down on his stomach would keep him safe from a grenade detonating inside a 250-pound metal box? Which leads us to our next question…
What did you expect would happen?
Okay, we’ll level with you: For a few moments, we honestly didn’t know what might happen. Like, of course shoving a military-grade explosive into an ATM would blow it apart into hundreds of lethal projectiles. But, then again, maybe it wouldn’t? ATMs are made to withstand a lot of abuse. A grenade would undoubtedly ruin the thing, but perhaps it’d stay largely intact after cartoonishly launching into the air to the tune of a slide-whistle?