To paraphrase the great Oscar Wilde, to miss one penalty is unfortunate - but to miss two could be interpreted as careless.
Sergio Aguero certainly did not seem very pleased after erring twice from the spot in a wretched first half against Steaua Bucharest on Tuesday.
David Silva had eased tensions for Manchester City on a tough Champions League play-off away day by opening the scoring early on.
But the Argentine could have put the tie almost beyond doubt with his failed efforts, and he endured the wrath of Twitter for the double miss...
Joe Hart could take penalties couldn't he?
β Mike For Mayor (@mikebirty) 16 de agosto de 2016
3 - Sergio Aguero has now missed three of his last four penalties in European competition for Man City. Misfire.
β OptaJoe (@OptaJoe) 16 de agosto de 2016
4 - Sergio Aguero has now missed four of his last five penalties for Man City in European competition. Update.
β OptaJoe (@OptaJoe) 16 de agosto de 2016
Mark Noble > Aguero.
β West Ham Central (@WestHam_Central) 16 de agosto de 2016
Kun Aguero does it again!
β Steaua BucureΘti (@FCSteaua) 16 de agosto de 2016
Guardiola will slap Aguero
β KD (@KunDeBruyne) 16 de agosto de 2016
Aguero lined up the spot kick and taught to himself, what would Lionel Messi do? And booom, the ball is sent flying, high into the stands
β Qi (@VeekSterzz) 16 de agosto de 2016
Aguero has missed 2 penalties in the first 20 minutes. Never thought he was any good.
β Gary Lineker (@GaryLineker) August 16, 2016
Aguero's good but he's not quite Hazard though is he.
β #CarefreeDaily (@CarefreeDaily) August 16, 2016
Aguero sent that one into orbit
β LeanderAlphabet (@LeanderAlphabet) August 16, 2016
..... - Goal