On the first eviction when Brian is talking to the house he'll slip up:
'Okay right, everyone - ready? Okay let's do this guys! I am now going to talk to the house 
... Big Brother House, this is Davi- Brian! You are live on Channel 5 Please do not swear! 
I swear - he'll either say Channel 4 instead of C5 or say Davina instead of his own name.
It'll be quite funny and perfectly understandable.
Davina's line has been iconic and always said by fans and stuff - it's only natural if he slips up, I mean you try saying 'Big Brother house this is Davina' 10 times and then replace Davina with Brian - you might slip up.
Does anyone else think he will? And look forward to it?
