"を"　と　"に" ”電車を乗り換える”　と　”電車に乗り換える”　どちらが正しいですか？

”俺でしゅ” Guys talked about something and one of them suddenly said ”俺でしゅ” and then others started to laugh, why? What's funny in this form?

”A答えてたら” in english? ”A答えてたら” - how to translate this correct?

Как точно переводится "If I had chosen this ..."? Как переводится "If I had chosen this ..."? Мне покоя "had" не дает, и кажется, что перевод "если я должен это выбрать...", но хотелось получить "Если бы я выбрал это, то ...", и я сомневаюсь уже...

"Yes" or "No" for question This is dialogue between two people. First saying: "I want to go, but you didn't call me". How should the second person answered? "Yes, I didn't call you!" or "No, I didn't call you!"

だだハマり What's mean "だだハマり" ?

Can you recognize this? I can't understand what written on this picture: http://s14.radikal.ru/i187/1310/37/bff6e0672427.jpg It's too small... Can you help me?

What mean "五・七・五" ? What mean "五・七・五" ? Or what can it mean? Maybe it is the common phrase that have some inner meaning?

角っこ What mean "角っこ"? Example, in this sentence : 角っこを触るクセがあります。