Schewpps Tonic Water 1977 advert featuring the party crashers.
In the late eighteenth century, Johann Jacob Schweppe (1740–1821), a German-born naturalised Swiss watchmaker and amateur scientist developed a process to manufacture carbonated mineral water, based on a process discovered by Joseph Priestley in 1770, founding the Schweppes Company in Geneva in 1783. In 1792 he moved to London to develop the business there. Mainstay products include ginger ale (1870), bitter lemon (1857), and tonic water (The oldest soft drink in the world – 1771).
An ad campaign in the 1950s and 1960s featured a real-life veteran British naval officer named Commander Whitehead, who described the product’s bubbly flavor (effervescence) as “Schweppervescence”.
Info gleaned from Wikipedia