Organising meals for my department while I was still working could be a nightmare. These things in particularly irritated me
1) ordering from an advance menu - I would have to make sure I kept a copy as nobody could remember what they had ordered
2) people who would "have to" go home early leaving you with exactly enough for what they ate -so when service was factored in, yep, you're short of a few quid
3) one colleague who was tight with money but always chose the most expensive item (by a long way!) and then "absolutely" agreed we should just divvy up the total by the number of people there
4) people who claimed they should pay less because they only had soft drinks, ignoring the massive mark up on soft drinks in most pubs and restaurants.
No matter how you divvied up the bill there would be that awful business of half of them paying by card, half waving £20 and £10 notes but wanting change and inevitably when it was all done and dusted (or so you thought) you were somehow short and the few who were left always ended up lobbing an extra fiver into the pot.
Nightmare.