This doesn't happen often, so in the rare occasions that it does you have no choice but to brag about it :-)
To be honest, I don't remember finishing my daily quest in five battles before. The reward cards are nothing to speak about but I didn't work hard to get them, so no complaining from me:
Have you ever finished the daily in five matches?
Mmh, no idea to be honest!
Nice run! Now that everyone has been leveling up their cards it has been harder for me to get on winning streaks.