LOL ... I just say I do. Actually I like it when I get a chance to work at home. I get more done because there are less distractions there than at work.
I used to work from home half time (alternated 3 days a week one week, two the next). I found that I got more done in less time than when I worked in the office. The only drawback to the system was I was spending more time when I was in the office dealing with people that would save up contacts instead of getting ahold of me when I was working at home. It did get quite annoying.
I have worked from home a couple times recently, and have found that I don't get as much done now since I have kids. They don't understand the concept of working from home and want you to play with them since you're home....
I now work primarily from home, have on and off for several years, never found it to be a big issue really though I don't neccesarilly do all my work during "normal working" hours, I tend to have a good bash at 4 or 5 hours work in the morning/early afternoon then get the remainder done later in the evening.