Found an octagonal G&T with an octagonal mat. All is well with the world now...
Or it would be if it was a G&T rather than a gin and soda water.
Tried to send it back but the complaint was translated to the bar staff as this tastes like water so they just fired more gin in.
Someone saw I still wasn't happy and intervened and the result was add more gin.
Tastes pretty crappy but it's sure going to work.