A group of men immerse an idol of Lord Ganesh into the sea in Chennai, on Sunday, to mark the end of the week-long Ganesh Chaturthi festival. The Madras High Court has directed the state Pollution Control Board to evolve a scientific method of immersing Ganesh idols made of plaster of Paris and other harmful chemicals which have an adverse effect on marine life and marine eco-systems. AFP
Immersion of a goddess called Durga
Devotees immerse an idol of goddess Durga into the Hooghly river in Kolkata on Sunday. Reuters
An immersion of the idol of the goddess (Durga) in the Yamuna in New Delhi on Oct.5.
So we see that tevilat kelim is not a purely Jewish phenomenon.
So as not to spoil the joke, a partial explanation is in the comments.