On a serious note:
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The incoming missile sounds hypersonic (probably a JDAM) which is definitely not something that Hamas could construct or has fired before.
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The speed and straight trajectory of the projectile from videos suggests that it's nigh impossible to have been a misfire.
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IDF and Israeli spokespeople had wildly different stories after the strike, trying to shift the blame to Hamas, suggesting they all knew it was Israel who fired that rocket, and it probably did it intentionally, but they hadn't gotten their stories straight. Most glaring example, is the IDF video supposingly showing the Hamas rockets being fired over the hospital, and the video was timestamped 40 minutes AFTER the strike had occured at the hospital (if it was on the same day even). They then immediately deleted it as soon as they got caught. Another example is an Israeli official claiming that Israel had targeted the hospital because Hamas had used its roof to fire rockets.
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You don't need to be an expert to figure out what's going on here:
a) Israel is a murderous apartheid regime and this is something they have done before.
b) Israel has wiped up its population in a murderous frenzy, and they need to satiate it.
c) Israel has been dragging its heels on its fabled ground invasion of Gaza, with various excuses. It knows that it can't beat Hamas on the ground, and it has been warned by Hezbollah against invading. It wouldn't surprise me if they used this strike to satisfy their people politically, and then tell them that the US forced them to a ceasefire over this incident.