Feng Shui says that sharp pointed articles generate the Sha Chi Energy. Sha Chi is the malefic negative energy which disrupts the natural flow of the Chi Energy which is the natural harmonious vibratory energy prevalent in the atmosphere. Hence as per Feng Shui, such sharp and pointed articles like scissors, blade or a knife should never be gifted to anyone.
Feng Shui says gifting such articles are a threat to your friendship with the one whom you gift such articles to. If they are gifted to a lover then there is a possibility of a break up.
Feng Shui also further preaches that such sharp and pointed articles generating Sha Chi have to always be kept hidden from view in the home or office; like in a cupboard, when not in use. It is also advised never to keep Show-pieces like knifes, arrows, spears and swords in the house as such show-pieces generate negative energy which gives rise to quarrels and disrupt peace in the house.