I was hitting the snooze button this morning but I could hear Buddy's morning whistling ritual downstairs so I listened for a while. All of a sudden amongst his whistles I hear "Hi WALLE” I thought I dreamt it so I listened more intently and sure enough he says it again really clear. After he said it couple more times I decided to whistle back, and after my whistle dead silence.
So I guess Buddy's a secret talker but still made my day. Not sure why he learned "hi walle" not "hi buddy" and I wonder if that annoys WALL-E