If you miss something in the theater, you are working through it; you'll get it tomorrow. It's easy to forgive yourself in the theater. On television, you do one shot. All you've done rehearsal-wise is be blocked. There is all this pressure to get it right then.
About six months after I moved to New York City, I was literally down to my last twenty dollars when a friend of mine from college got me a job at an Upper East side gym. I ran the cafe, and I was the janitor. It was an unfortunate combination of duties, to say the least.