This article is classified "Real"
The now classic Gate Crasher's Entrance is a useful way to get into
a party without knowing anyone, but without those whom you don't know
knowing that.
Pre-requisites: Some sort of (unopened) alcoholic beverage [1].
Nonchalance.
Procedure: Simple. Just stroll into the room as if you know at least
half the people, making greeting gestures to occasional chairs, lamps
and doors. This is always a good bet, because usually half the
people don't know the other half, and assume that this is the half
that you know. The other half act likewise.
Pitfalls: Don't try this when there are less than four people
at the party.
[1] Some more experienced Hitchhikers like to apply the "Fat Slag
Variant", which consists of filling an empty spirits bottle
with an appropriately coloured fluid, and then "accidentally"
smashing it on entering the party.