Steins;Gate episode 7 & episode 8
Mayuri: “Kurisu will be all over you if you wear this, Ruka. She really gets off of that cosplay!”

Okarin’s thoughts: “Mh… Kurisu all over Ruka. Would that count as yuri?”
In episode 7, a lot of interesting stuff is going on. Like Kurisu being a tsundere queen. Anyway, Okarin tried to use the Phone Microwave (name subject to change) to win the lottery. When he sends the message, the past does indeed change. He apparently told Urushibara Ruka the lotto numbers. The numbers were correct, but Ruka failed and got the last one wrong.
Being shocked that the experiment succeeded, Okarin goes downstairs and meets Suzuha, who tells him he looks like he was brainwashed. Stating that may actually be possible, Suzuha panics, drags him to the bench and checks his eyes.

Suzuha: “Don’t move, this french kiss will blow your mind.” Okarin: “Wha…”
Wouldn’t it have been interesting if that actually happened?
Saying there is no chip, Suzuha tells Okarin he wasn’t brainwashed, which further supports the possibility that Suzuha is actually from the future. On a side note, I found myself growing rather fond of Suzuha. She is kinda cute in a way.
Episode 8 was interesting on a whole new level:

*grab* It’ll hit her any moment now. Hard.

Ah, there it is. Reality is harsh indeed.
Okarin wants to change the world line again to confirm if he can retain his memories after such a change. To do so, he sends Daru a message giving him an advantage in a card game with Feyris. But the world line does not change and Daru still lost instantly. Kiryuu Moeka wants to send the next message telling herself not to buy a new mobile phone. After sending that message, the world line changes, and Moeka is not known to Kurisu, Daru and Mayuri anymore, because she never came to the lab.
Urushibara Ruka, our delicious trap, overheard Okarin talking about the time machine in the lab and came there the next day to ask Okarin if he can send the next D-mail. What he wants to achieve by this is lunacy. Utter madness:

WHAT?! The delicious trap wants to disarm himself and become delicious cake? I’M IN!
Ruka wants to change his gender by telling his mom to eat a lot of veggies while she is pregnant (yes, I know. This is the reason why they even agreed to his request). When he sends the mail, the world line actually does change, so something has to be different. But Okarin cannot observe any change after staring at Ruka’s chest. He realizes it’d be difficult to just ask whether Ruka became a girl or not. Will Ruka be disarmed and become cake? Will Kurisu finally admit she actually loves Okarin? Will Mayuri grow a brain? Will Suzuha strip naked? Questions over questions…