At what point does a trickle turn into a waterfall? We have no idea. That's the kind of waffly nonsense we don't usually have to concern ourselves with when talking about sport but perhaps it's a question that we're going to need to start asking ourselves more and more.
When do we hit the panic button? Contracts are running out quickly ahead of the summer and players that were once happy to stay at home now have offers from abroad that the Irish provinces just can't compete with. On Wednesday, it was reported that Marty Moore is about to join Leinster teammate Ian Madigan in the departure lounge with a move to Wasps all but certain.
That was a big blow and now, just one day later, it's being reported by the Irish Times that Munster are set for what may be an even bigger blow with news that James Cronin is '75%' certain to leave the province with an unnamed English Premiership side set to benefit from the arrival of the 25 year old prop who has two Ireland caps to his name.
Cronin has been one of few bright sparks for Munster over the past couple of seasons and it now looks likely that the province will have to rejig their front row significantly this summer with South African prop BJ Botha also set to leave Thomond Park. While the former Springbok's departure had been expected, the possible loss of Cronin is a blow to Munster and another blow to Ireland following the departure of the likes of Madigan and JJ Hanrahan.
And as if Munster needed any more bad news, it looks like Leinster have beaten them to the signing of Ian Nagle. The former Munster lock has been a wanted man after letting it be known that he was ready to end his self imposed exile from the professional game.
The 27 year old lock is currently playing for Cambridge University after leaving Munster in 2014 to begin an MBA course at the university. However, he's now ready to return to the pro ranks and although Munster were thought to be in talks to bring him back to the province, it seems Leinster have convinced the Corkman to make the move to Leo Cullen's side.