Article in English: Remember not to apply excessive force. If you are too rough, you might shatter one or both of the glasses. If the glasses come unstuck unexpectedly, they might slip or shoot out of your hands. Make sure that you have a firm grip on each glass. Dry the glasses before you begin, and dry your hands. If your hands slip, the glass might fall and shatter! Sometimes, there is a thin layer of water between the glasses that keeps them stuck. Try squeezing a straw between the two glasses, then blowing in. A small amount of air should suffice. However try blowing in as much air as you can because the straw is being squeezed.

Summary in Indonesian:
Pisahkan gelas dengan hati-hati. Cobalah meniupkan udara di antara kedua gelas.