Rahu in the 5th house for a Scorpio Ascendant. The results of Rahu will differ according to the placement of the lord of 5th house, Jupiter, in the birth chart. But a lot will depend on the position of Saturn, lord of 4th house, in the birth chart.
If Rahu is placed in the 5th house in the sign of Pisces but if the lord of 5th house, Jupiter, is placed in the 4th house in the sign of Aquarius then this placement could make you a technology expert as Aquarius is a sign of all the modern technology and also currently we are running the age of Aquarius where we can connect from people all over the world through technology such as internet and mobile phones and everything has become digital. All this digital technology is nothing but the representation of the sign of Aquarius. Aquarius is a sign of being collective and the technology such as the internet and computers help us in being collective though maybe from behind the scenes.