I don't knowingly defraud my company but I am sometimes not the best at keeping up with dinner receipts, taxi receipts, etc. When I fill out my time report a few weeks later I sometimes have to take creative license when filling out the expense report because I really don't remember how much dinner was if I ate really inexpensively one night (for example, a salad and iced tea at Applebee's where I paid cash). I will put in all the amounts I know and then just make up the rest. We are reimbursed for breakfast and dinner. Most times I am running too late for breakfast so I consider breakfast to be the first meal of the day so that usually means I charge in my lunch. This is definitly gray in my book.

Thankfully my company is not nit picky on dinner expenses. We have to turn in receipts for any expense item over $25 but we can charge in alcohol with no problem. On an average week I will usually have two dinners that are over $75. Not once have I ever been questioned.

As far as "matress runs" while working out of town, no one cares if I do this as long as I show up on the client site on time each day. For almost 2 months last year I was changing hotels every night so I could get my Hilton Diamond status back. The difference between the cost of the two hotels I was flipping between was less than $20 difference a night. I charged in the full amount since both hotels were company approved hotels. My coworkers thought it was funny but it wasn't a problem with the "expense nazi's"

We thankfully have a miscellaneous line on our expense report. I usually add about $5 a day for little things as tips for the maid, doorman, coffee on the way to work. These don't even hit the radar screen and no I don't keep a detailed list of miscellaneous items, I just make up a small reasonable per day number.