Forum:Forgetting mandatory effects

What is the appropriate action for when a player forgets to perform a mandatory effect?

EXAMPLE: I control a face-up D.D. Survivor and it gets removed from play. At the end of my turn, I forget to Special Summon it with it's effect.

The people at my local card shop say you just keep going like it didn't happen, but they have a storied history of being wrong about things ("They ruled that the 'Envoys' don't have priority"; "You can activated Rescue Cat's effect during you opponent's turn"). Skullvarnish (talk • contribs) 23:22, August 20, 2010 (UTC)