Negative number of threads connected?

Today, I noticed that one of my machines was giving a negative number for threads connected.

Anyone care to share why the threads would be displayed as a negative number in mysqladmin ex output:

| Aborted_connects           | 0          |
| Connections                | 186        |
| Max_used_connections       | 0          |
| Threads_connected          | -31        |
| Aborted_connects           | 0          |