Congress leader Sanjay Nirupam on November 10 said that his party should refrain from any political experiment with the Shiv-Sena as it will prove fatal for the grand-old party. “Congress-NCP govt in Maharashtra is only an imagination. If we want to convert that imagination into reality, it won't be possible without Shiv Sena's support and if we take Shiv Sena's support, it will be fatal for Congress,” Nirupam told ANI.