Which common quality connects?

Cracked by: gammafunction , Phani , shenoyvarun86 , nihit , akhi , pinaki sarkar , anirudh , madhur , udupendra , Kamal Rathi , Goyal , Achilles , abdulla , bhootha , piezocake.

gammafunction, Phani, shenoyvarun86, nihit, akhi, pinaki sarkar, anirudh, madhur, udupendra, Kamal Rathi, Goyal, Achilles, abdulla, bhootha and piezocake