几个人从动漫展回来遇到Penny带着一个男的回家，于是决定劝Leonard考虑发展别人。Leslie收到Howard短信通知Leonard失恋后，又主动联系Leonard准备认真发展关系。Leonard让Sheldon避一避，Sheldon执着地坐在楼道上打游戏，就是不肯出去。
Leonard送Leslie出门时遇到Penny和新男友回来，两人心照不宣地吻起面前的伴侣给对方看，很是小小PK了一下。
Sheldon由于Leslie对他的奚落一直不能接受这个人，他终于想到一个办法，回来挑起争论，他的弦理论和Leslie的量子圈理论势同水火，Leslie要求Leonard表态占边，然而Leonard支支吾吾，最后承认他更支持弦理论。考虑到后代的教育问题，Leslie认为这个根本不相容的世界观是个严重的原则问题，夺门而去，Sheldon成功拆散两人。
You're nitpicking. 你这是挑毛病
This is my friend, Eric.
How did we get on me? 怎么说到我身上了
I'd hit that. 我赞同
That was it. 仅此而已
I heard your relationship with Penny crashed to the ground. 我听说你和Penny吹了
Where did you hear that? 你是听谁说的
I'm flattered. 我深感荣幸
Don't make this hard for me. 别让我难做
Hold on. 等等
Where is this coming from? 这从何说起
You're losing me. 我快跟不上了
Let me put it this way. 这么说吧
Hang on. 等下
Are you gonna let him talk to me like that? 你就让他这么和我说话啊
It's a deal breaker. 这是原则问题
