Planting a grow-in-water toy in a woman's womb so that she will bear the toy on April 1st would make a good prank. amirite?

You think women just carry around a sac of water (amniotic fluid btw) in their wombs? AHAHAHA.

I am disgusted yet curious.

Because it can digest the endometrium for successful implantation, and appear exactly the same as an embryo to the body.

That would be painful.