How would you celebrate a goal on your old club? Like Will Johnson or Robin van Persie? | SIDELINE

Five goals later, Will Johnson's gesture was an afterthought.

But when the Portland Timbers captain opened the scoring in his team's first-leg Western Conference Championship loss against former club Real Salt Lake, he refused to celebrate (watch it above or click here).

Despite the significance of the moment -- the upstart Timbers are one round away from the MLS Cup final -- Johnson could not simply forget the five seasons he spent in Claret-and-Cobalt. While his teammates celebrated, he didn't even break a smile and went back about his business.

Now compare that to the grief that Robin van Persie is getting in the English press after celebrating his game-winner against ex-club Arsenal in Premier League action last Sunday (watch it below), especially after refraining from an all-out celebration on two previous goals he scored against the Gunners.

Van Persie joined Arsenal for the 2004-05 season and eventually became their captain during his eight seasons in London before moving to Manchester United in August 2012.

So who did the right thing? How many goals can you score before it's ok to celebrate? How much time needs to pass before you can celebrate? Is it ever right to celebrate against your ex-club?

Have your say in the comments section below and be sure to log your vote.