There’s a bunch of them, but one more common example is Androgen Insensitivity Syndrome.

It’s also possible to have a non-functional SRY (XY but female), or to be XX with an SRY translocation (XX but male).

Biology is complicated: pretty much anyone who says it only happens one way or is really simple is wrong.

shutdown: command

This is a bit misleading. You only need to treat the first generation of 2n watermelon with colchicine (which inhibits the movement of chromosomes during metaphase) to produce a 4n watermelon. Once you have a 4n watermelon, subsequent generations do not require colchicine treatment.