1. One or more computer-readable storage media storing computer-readable instructions that when executed, cause a computer to perform a method, the method comprising: identifying a transmit clock domain associated with a transmit clock and a receive clock domain associated with a receive clock; identifying a clock domain crossing signal that originates at an output of a transmitting register in said transmit clock domain and is applied as an input to a receiving register in said receive clock domain; associating a metastability effects generator with said clock domain crossing signal; and causing said metastability effects generator to inject metastability effects onto an output of said receiving register when said transmit clock and said receive clock are aligned.