The Latics are again in survival mode after victory at West Bromwich Albion.
Scharner, 33, who spent four years at Wigan from 2006-2010 and returned on loan from German side Hamburg in January, said: "It looks like Wigan are always waiting for the last game of the season.
"Maybe they need to keep the season exciting! If we're mid-table no one is excited. They are always looking to fight against relegation.
"Just look how many grey hairs I've got - that's from Wigan!
"We said before the game it's a must-win game and we won.
"We still have three games left to play and we have to carry on and it's just like the song says: 'We are believers'!"