The Korban Pesach was an earth shattering event!
Since Adam HaRishon, Korbonos were brought, but only Olahs.
To think that a human being could partake of an offering to Hashem was absolutely unthinkable and the extreme height of ridiculousness and absurdity.
Until Hashem made us His people, His children, an AM KODESH
This was the first time there was a people who even their bodies were Holy to the extent that they could eat of Hashem’s Korbon.
–very loosely paraphrased from R’ Avigdor Miller, tz’l–