Bankers' Rounding.
This one is not so much a compiler bug or malfunction, but certainly a strange corner case...
The .Net Framework employs a scheme or rounding known as Banker's Rounding.
In Bankers' Rounding the 0.5 numbers are rounded to the nearest even number, so
Math.Round(-0.5) == 0
Math.Round(0.5) == 0
Math.Round(1.5) == 2
Math.Round(2.5) == 2
etc...
This can lead to some unexpected bugs in financial calculations based on the more well known Round-Half-Up rounding.
This is also true of Visual Basic.
