The impossible appearance of a pen in a bottle.
Show an empty plastic bottle and suddenly a big sharpie pen materializes inside the bottle. Dump the pen out and show it.
Note that this has very bad angles and can only successfully be performed in front of a camera or one stationary viewer. Great for YouTube and video chats but not an item performable with a live audience. Gimmick is easy to make.
1st edition 2022, video 8:52.