[Marsh.]

Not sure about favourite, I'll just write down the first that comes to mind for each series.

BB1: "It's only a game show, it's only a game show!!!" - song they used to always burst out with when things got stressful.
BB2: "I love blinking I do" - Helen
BB3: "Am I minging?" - Jade
BB4: "I could kill someone with these two fingers." - Lisa
BB5: "No naked Jacuzziness!" - Michelle
BB6: "Tweedle-dee, Tweedle-dum and Tweedle-TWAT!" - Science or "I will not diminish my character in order to survive." - Craig
BB7: "The second person to be evicted from the BB house is.... SEZER!" *best reaction ever*
BB8: "Posh Spice? Fu**in' Posh Spice? You fu**in' wish! Ugly bitch!" - Charley
BB9: "I'm just dunking this custard cream in this hot juicy tea." - Mario
BB10: "Your voice is actually giving me a panic attack." - Halfwit/Freddie
BB11: "Whenever I'm feeling low I just think of that woman who got her face ripped off by a chimpanzee." - Josie
BB12: "You look like a burnt witch!" - Louise
BB13: "I don't want to be known for my famous boyfriend." - Lydia
BB14: "Soar, soar, Charlie, soar!" - Callum