In the Red Nose Day special, The Curse of Fatal Death, the final regeneration of the Doctor, played by Joanna Lumley, enthusiastically remarks that the sonic screwdriver "has three settings" when it starts vibrating.
In a comic The Catherine Tate Show sketch, Catherine Tate's teenage character Lauren Cooper accuses her English teacher (played by David Tennant) of being "the Doctor". After much provocation, the teacher uses the sonic screwdriver to transform Lauren into a Rose Tyler action figure.
Slide guitar is most often played (assuming a right-handed player and guitar):
With the guitar in the normal position, using a slide on one of the fingers of the left hand.
With the guitar held horizontally, belly-up, using a metal bar called a "steel" ("slides" generally fit around a finger) held with the hand and wrist above the frets, fingers pointing away from the player's body; this is known as "lap steel guitar". This same technique is used to play pedal steel guitar and the "Dobro" resonator guitar used in Bluegrass music.
A relatively new technique, expanding the musical range and sonic capabilities of slide guitar, is the system of double slide guitar. It was invented by Brian Cober, a Canadian blues musician. In double slide, the first slide is placed on the middle finger (usually a modified steel bar that can be put on the finger), and a modified thumb slide is put on the thumb that is able to cover two strings. Double slide is meant to be played on a six-string lap guitar (or a regular six-string guitar modified with the strings raised for high action like a lap guitar), usually tuned to open E tuning. The double slide guitar system enables the player to play chords not heard in open tunings, such as minor chords, dominant seventh chords, etc. and provides a greater use of technique in soloing. Will Ray of the Hellecasters uses a similar technique, wearing "stealth" pinky-type slides on either hand.
The lap steel guitar (also known as a Hawaiian guitar) typically has 6 strings (and sometimes 8) and may have various tunings. Originally the 'standard' EBGDAE tuning was changed to allow 'open' i.e. major chord tunings to accommodate using the straight steel bar and not require changing string gauges. Currently a new generation of musicians use open tunings (e.g. Open D), but typically, Hawaiian music for virtually the last 100 years has used more complex tunings once musicians could manipulate bars to execute diagonal barrings, both forward and back. Hawaiian tunings evolved from A Major and E Major to E7, C sharp Minor, C sharp Minor 9th, F sharp Minor 9th, B11th and the popular E 13th. Jerry Byrd is credibly the originator of the C6+A7 tuning ECAGEC sharp(CA) which allows a wider ranging of chording for Hawaiian and many other forms of modern music. (Reference Needed) It differs from a conventional or Spanish guitar in having a higher action and often a neck that is square in cross section. The frets, unused in steel style playing, may be replaced by markers.
There are three main types:
Lap slide guitars, which are acoustic instruments but may have electric pickups for amplification in addition.
Resonator guitars, which are also acoustic instruments but may have pickups for amplification in addition.
Electric lap steel guitars, which are normally solid body.
Early lap steel guitars were Spanish guitars modified by raising both the bridge and head nut. The string height at the head nut was raised to about half an inch by using a head nut converter or converter nut. This type of guitar is claimed to have been invented in about 1889 by Joseph Kekuku in Hawaii.
Some lap slide guitars, particularly those of Weissenborn and their imitators, have two 6-string necks, but electric and resonator lap steel guitars are normally single neck instruments.
Square-necked resonator guitars are always played in lap steel fashion, and so are specialized lap steel guitars. Round-necked varieties can be played in lap steel fashion, with some restrictions on the available tunings, but can also be played in Spanish position.
The Rickenbacker frying pan, an electric lap steel guitar produced from 1931 to 1939, was the first commercially successful solid body electric guitar.