My sister (the one I bought the cell phone for) is not very good with comebacks. Her worst (and funniest) remains: "Yeah, well your mother's so fat that when she had her period, it came out red." We've never let her live that one down. But she's funny when she's mad, so I try to get on her nerves as much as possible.
You already greeted me today, Deet. Oh, you mean the impostor?
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia