[His eyebrow pops up. What a polite dare, but then, perhaps this is simply a polite plant.]

Let's see... it has to be a pitch you can hear, right?

[He's a Westie so this could get a bit high but also he has no idea how plant ears work. This guy definitely has ears but what's his hearing range?? Let's start with helium balloon pitch...?]

^{How 'bout this? Should I go higher}??