The odd thing about it is that they are required to be in my class to help control the students and presumably to learn English as well, which I am thankful for. But when the class is going smoothly and I don't really need any help, the Thai teacher often tunes out my lesson, opting instead to open up his or her laptop and squeeze in a couple games of solitare or log in to Facebook or whatever it is they do.
Not only does this give students the message that it's acceptable to ignore my lesson, but aren't the Thai teachers shooting themselves in the foot when they waste a great opportunity to learn English from a native speaker along with their students???!!!