Evan has been one of Mei Ling's best friends since high school. Evan is excited for his role as witness as he had plenty of experience witnessing things. These include, but are not limited to, the death of a mosquito, the theft of a cookie and the deterioration of a shoe. Evan reacted to these events the same way he reacts to everything else he's witnessed, with awkwardness and hunger.
Alex is Mike's best friend from high school. When asked if he would be Mike's witness, Alex originally said no as he did not want to get in trouble with the mob. Not again. Not this time. Especially in this economy. Mike wasn't sure what Alex meant by all this, or why he started hyperventilating, but Mike was able to assure Alex that he would be nicely compensated for his work. Now Alex is the proud owner of two pounds of ghost repellant.