Oh, but not always. My flatmate sometimes bakes ridiculous beetus cakes and always offers them to me since I have a massive sweet tooth (and I do) and she can't possibly finish it all by herself. I thank her and never go near the cake and she manages to finish it just fine despite complaining about there being sooo much left and pestering me about it. Sometimes I accept and she cuts me a 1/8 slice.. which I then split in half saying I couldn't possibly eat more. She finishes the rest.