IdiomCenter.com

spin (sb) a yarn (to tell a story, especially a long drawn-out or totally fanciful one; to give someone a long detailed excuse or explanation that is completely false) — рассказывать, сочинять (длинную /запутанную / интригующую) историю; лихо закрутить, завернуть интригу, сюжет; || рассказывать, плести небылицы; вешать лапшу на уши

You could've fooled me. {infml} — Так я и поверил! Ищи дурака — так я и поверю! ~ Ну кого ты пытаешься обмануть? ~ Ври, да не завирайся. || Не может быть! (удивл.)

Used to say that you do not believe what someone says about something that you saw or experienced yourself, or that you are very surprised by what they have said

Don't give me that! (something that you say when you do not believe an explanation that someone has given you ) — Не надо мне лапшу на уши вешать! Не надо ля-ля {просторчн., груб.}; Да ладно заливать-то!

see also
[так я и поверил]

phrases to express disbelief :

Give me a break!

'puh-lease.'
Extremely popular but it's losing it popularity gradually through overuse. An emphatic phrase that is similar is 'please' but you'll hear it as a 2-syllable word. Both phrases mean 'I can't believe you're telling me this or that you even believe it yourself. It is so obviously wrong.'

см.
[pull sb's leg]
[wind sb up]
[do a snow job on sb]
[pull the wool over sb's eyes ]
[don't give me that!]
[spin a yarn]

[cock-and-bull story]
[lead sb up the garden path]
[бабушкины сказки]
[бред сивой кобылы]
[морочить голову]
пудрить мозги
заливать
семь верст до небес
семь верст -- и все лесом