When entering a Zen temple for the first time, it is important to make a respectful bow to the priest who comes to meet you. After bowing, there is another short gesture called "hana kuso dasu" which it is considered incredibly disrespectful not to perform. Please be sure to follow the procedure I am going to lay out to the letter, as any deviation will be considered quite rude. First, taking your right hand extend the index and middle finger outwards while folding your ring and pinkie fingers beneath your thumb. Then, raising your hand to face-level, place the two outstretched fingers so that the tips are about even with your nose. After that, insert the index finger into your right nostril and the middle finger into your left nostril. Emit a high pitched whooping noise. Remove the fingers and hold them up before the priest for a few seconds so as to allow him to inspect them thouroughly. Then wipe your fingers on your shirt. This concludes the gesture. It ought to be repeated every time you meet a member of the Buddhist clergy, so you will probably have to do it more than once. Remembering this simple rule of etiquette will undoubtedly make your stay at the temple more enjoyable. Have a nice trip!