Hebe叫Selina & Ella [姐]
hebe calling selina and ella "elder sister".
actually there's far more videos of it, but i'm too lazy to collate them.
so i just make do with those that i have re-watched recently. =)
S.H.E trivia:
they have lots of nicknames for each other, such as "大宝，二宝，小宝"
大宝 is selina, because she has fast reaction when tripped or scared by others.
no idea about the other 2, but i guess hebe would be 小宝, which means the smallest and pig (hebe is born in the year of the pig).