With Interrogation Skills That Would Make Jack Bauer Proud

Mobile phone ringing...
Sharkteeth: Hello. Sino ito?
[Hello. Who's this?]
Caller: [answered]
Sharkteeth: Eh sino nga ito?
[But who's this?]
Caller: [answered again]
Sharkteeth: [screamed so loud the phone almost clammed up shut and scurry away]TELL ME THE TRUTH! WHO ARE YOU?!

Apparently, it was mother, who changed her voice to confuse Sharkteeth.