What if you are down to the last Char Siu Bau (叉燒包)?
This eventually happens during worship of this glorious BBQ pork filled dumpling. Everyone has had some, so there is no pre-defined ownership established on this tasty treat.
There are several approaches to gaining the last Char Siu Bau while appearing pious and contemplative. For example, point to the window and exclaim "Look - a flying Ha Gow!", then make a grab while others are looking. It could become a problem, if the others think that you have seen a sign, and have to order a round of Ha Gow to contemplate the meaning of the message you had received.
Maybe you could slowly pull the table cloth, so that the steamer is closer to your plate. This would allow for a quick grab when the next trolley passes by the table. Be sure to take off the paper from the back of the Char Siu Bau before you eat it.
Running out is rarely a problem. The waitress would tell you if there are none left, but it would only happen if you were conducting worship late in the day. Generally, there is an overall attitude of abundance. With an abundance mentality, you have a belief in the unlimited supply of the heavenly treats. If you run out on your table, you just order more. There is always more. All the believers are free to worship to their heart's content. How does this happen you ask? Well perhaps it is one of the mysteries that are beyond human understanding. But whatever the cause, the effect is certainly to your benefit.