Listen to the sound clip But you gotta push the envelope if you want to impress me, which of course you do. from Buford Van Stomm - Phineas and Ferb: Quest for Cool Stuff - Character Voices (Wii):

But you gotta push the envelope if you want to impress me, which of course you do.

This sound is from Buford Van Stomm - Phineas and Ferb: Quest for Cool Stuff - Character Voices (Wii)

Character Voice sounds from the Wii game Phineas and Ferb: Quest for Cool Stuff.