Tisseo is the public transport network serving Toulouse and its surrounding area in southern France, operating buses, trams and metro lines used by commuters every day. Its validators produce a short electronic tone when a pass or ticket is accepted, a sound regular passengers quickly learn to associate with boarding. Short clips of everyday transport sounds like this are often shared online by creators documenting city life, travel vlogs and local humour, where a familiar beep can instantly place a scene. Its continued use comes from that instant recognition rather than any wider meme trend.