There is a pie vending machine behind the rooms. Did you try to catch one pie?
Yeah, you would need some money.
Yes, there is a rich man checking in to the hotel given that you have visited your friends.
He is guarding the bag. Steal the bag.
Did you notice that Bozo has similar bag? Go grab Bozo's bag.
Go to the restaurant (behind the reception) and switch Oppenbot's bag with Bozo's bag. Look at the bag and you get some paper money.
Who would need paper money more than you, now?
The toilet paper quality of this hotel is known to be worst.
Give the paper money to the future traveller in the toilet. He will give a coin as a change. Now you have coin.
Maybe you could grind it smaller.
Did I mention about the quality of the toilet paper in this hotel?
Well, get some of that sand .. err.. toilet paper and make the coin smaller by combining the toilet paper with the coin.
Go use it to the vending machine now. One pie, pour favor.