Herobrine
Gamechap and Bertie have been famous for making videos of the Herobrine Mod by Burrner. When they make the videos, it generally involves them going very freaked out, and screaming whenever Herobrine pops up. The most famous remark is from the first video they made of the mod where they spotted a massive Glowstone 'E' and since then have been scared of the letter.
Gamechap: There's an 'E' over there old boy!
Bertie: E?
Gamechap: E! Say it together old boy!
Both: E!