Do not be confused with the Immaculate Conception, which
is not an uncommon mistake. I know someone who learned
this error in a so-called Catholic religion class, and remembered
it for 40 years.
Yes, I've heard this one all the time. It's one of my biggest pet peeves. I know I shouldn't be so irritated, because people have not been properly catechized. In particular I was shearing sheep at a small farm this spring and the sheep owner was commenting on how a particular ewe was accidentally bred despite the fact that the main flocksire was confined to a pen far away. I asked if he by any chance had an uncut ram lamb in the group, and he replied, "Well, if it wasn't that, it was an immaculate conception!". It's no joking matter to me, but I held my tongue. He obviously had no clue what he was talking about and discussing the dogma of the Immaculate Conception versus the Incarnation would have gotten me nowhere. I don't even know if he was Catholic. He was a younger person, perhaps eight to ten years my senior. If it came up in a religious discussion/debate, I certainly would have gently corrected him.