"I love Mondays"?

This is what I've heard this morning from one of my colleagues who works at reception. This is in fact the first thing I heard walking in the office. She said it with genuine enthusiasm, with a smile and everything, talking to the person next to her. I have to confess, I never had that feeling. Whatever the job I had, whether I liked it or not, I never loved Mondays. Sure, some Mondays I enjoyed for specific reasons, due to specific circumstances. But Mondays in general? Nope. I always had a feeling of gloom and doom Monday mornings. Whether I worked or not, actually. Maybe even more so when I was unemployed. So... Where does that feeling my colleague has come from? How can someone love Mondays?