Gersen realized that for an instant he had let his mask slip.

Both the Havelocks noticed the jolly mask slip with the few sharp words through the teeth.

Not a massive fan of AC - but I think we've finally seen the mask slip.

He's also starting to let the mask slip as the lies and misleading statements are increasingly replaced with insults.

It's just that they now feel that they can let their mask slip.

Romney let's the mask slip from time to time - just like when he joked (at an unemployed person) that he too is unemployed.

He saw the mask slip.

It was fascinating to see the mask slip.

Ronald Reagan always kept up his side of the bargain - at no time did he let his mask slip.

That night, he had seen the mask slip from Harriet Quimby and this was the second time.