While I know how it feels to be bored to tears, it seems like the real problem is not the show, it's the fact that you expect your boss and/or co-workers to pressure you about how you are feeling, almost as if you "owe" them a big reaction.
In a personal relationship, I'd want to address that head-on because it's not healthy. In a work situation, yeah faking it is probably your best bet.
My kids often want/need my enthusiasm over stuff that is mind-numbingly boring. And they can always tell when they don't really have my full attention. So what I do, is make my reaction about how happy I am to see *them* happy, and noticing what *they* like about it. 1) That is totally sincere, and 2) it redirects their attention back to the thing that made them happy in the first place, enhancing their enjoyment.
"I saw you laughing at that joke about [thing]! I thought you were going to fall out of your chair!"
"When the comedian said [wisecrack], I knew that was going to get you started."
"Oh, great. (sarcastically), Now the TPS Reports are always going to remind me of [joke Boss laughed really hard at]"
This has the added bonus that by watching for this stuff, it will take your mind off the mind-numbingly boring stuff.