[Amy]

Mary let rip at Roberto this evening when she grew tired of his constant grumbling.

Roberto was miffed when he couldn't find a scrap of loo roll on his visit to the toilet and immediately started lecturing the group.

But Mary didn't feel like listening and advised Roberto to calm down. She brushed the toilet topic aside sighing, "Live and let live."

Roberto wasn't standing for that. "I won't come and criticise if your bed is messy, but this is a communal area," he reasoned.

Taking the comment personally Mary squawked, "Why are you projecting this toward me? I've done nothing wrong."

Roberto explained he simply didn't agree with her laid back attitude. This maddened Mary further. "Just say what you mean and say it to my face," she growled.

Labelling Roberto a "big mouth" she warned him, "I'm not going to take any s*** from you!"

The housemates were flabbergasted by mystical Mary's outburst. Science even let out a little giggle.

However, Roberto was able to make a swift exit from the awkward atmosphere when Big Brother called him in for nominations.

Channel 4