Top this story on not splitting checks:
On my wedding day, the plan was that my fiancee (now ex) and I would work a half day, go to lunch at our favorite restaurant, and the wedding was in the late afternoon (civil ceremony at the courthouse.) Word got out at the office as to where we were going to lunch, and pretty soon the whole office, about eight extra people, invited themselves along. That was OK, sort of an office celebration, or so we thought. It turned out that WE got stuck with the whole check, to the tune of about $250. Adding salt to the wound, at the end of the meal one of the then-partners had to ask what the occasion was. AND to add insult to injury, I had to take the half-day off without pay since I had used up all of my vacation time. Now that I'm the HMFIC*, I try to be MUCH more generous with employees!
*Head Mother (something) In Charge