Just how different things might have been had the Icelandic volcanic ash cloud of 2010 not scuppered hopes of Lech Poznan's Robert Lewandowski joining forces with Sam Allardyce at Blackburn Rovers.
'I think about it every time I see him play,' Allardyce was quoted back in 2013, clearly pained at missing out on a player who makes the case to now be considered the best No 9 in world football.
Lewandowski eventually went to Dortmund and thrived. Blackburn, meanwhile, dropped as low as League One before lifting themselves back into the second tier in recent years.