Mark's teacher is randomly pairing his class of $16$ students into groups of $2$ for a project. What is the probability that Mark is paired up with his best friend, Mike? (There is only one Mike in the class)

[i]2015 CCA Math Bonanza Individual Round #3[/i]
1. First, we need to determine the total number of ways to pair up Mark with any of the other students in the class. Since there are 16 students in total, and Mark is one of them, there are 15 other students who can be paired with Mark.
   
2. The probability of Mark being paired with any specific student (including Mike) is calculated by considering that each student has an equal chance of being paired with Mark. Therefore, the probability of Mark being paired with Mike is:
   \[
   \frac{1}{15}
   \]

The final answer is \(\boxed{\frac{1}{15}}\)