"hmm-hmm"

"hmm-hmm" is what you will hear when my daughter needs to get past you..
"hmm-hmm" is what you will hear if you burp or fart near her and you don't excuse yourself quick enough
"hmm-hmm" is what the chair hears before she moves it out of the way....

no matter how much I work with her, I CANNOT get her to actually say the words "excuse me" it has always been "hmm-hmm". It is with the same intonation you would hear if you couldn't say the words and only the hmm-hmm's though.. hilarious.