Sometimes at a party we put our cups and glasses all on one table, and then we just can't determine which one is ours. This is again helped by designers who come up with interesting ways to identify.
For example, Mac Funamizu offers its own series of cups. In addition to the fact that these cups are multi-colored - and this cannot be called an innovation - they have one more feature. In their original form, these cups are nothing remarkable, but as soon as we need to designate one of them somehow, we just need to pull out the handle - literally manually assemble it from pixels. It is not difficult to do this, but on the other hand, it will differ from other cups by the presence of a handle, its shape, well, and, as already mentioned, a different color.
Then you can simply warn the guests that your cup is with a handle, and you will definitely not confuse them. The method may not be very effective, because any other person can do the same with his cup. But on the other hand, this activity is to some extent amusing - to assemble and disassemble the pen. Whether it is useful or necessary is a question.