Android .sort overflow demo
The good list has values which can be compared easily, and so gets correctly sorted as -10, -5, 0, 16 (ascending order).
The bad list has values which cause integer overflows and so gets incorrectly sorted as 2, -2147483647, -2147483646, 0 which is not the order the values are added in, and not the reverse order, but, instead, a repeatable order which is determined by the sorting algorithm used.