I'd think the easiest way would be slots -- put in room card, load the amount of money oyu want to play, play 1 hand (or lose it all) and cash out. Ticket (don't lose it) will be printed and wait till the next day to cash it out at the cashier. Easier as you do not have to interact with anyone asking about the OBC, just the slot machine. Blackjack, Roulette, etc... you have to ask the person at the table, then he has to confirm with the pit boss, etc...