That was great! Makes people pay attention. I had something like this on a West Jet flight last year. Almost the same, when the mask come down, place them over your face and breathe like this "Luke, I am your Father" (darth vader breathing). Also when we arrived, instead of the usual be careful of the overhead bins as you items may have shifted...we got, "Be careful opening the overhead bins, as your items may be excited to see you and jump to give you a hug."
The only other funny inflight announcement was, "Ladies and Gentlemen, there is a person on board today having a birthday. He is 85 years of age, and this is his first time flying in a plane. Give a round of applause for our Captain! Happy Birthday Captain!."