After reading the brilliant one about Foggy re-living Nelson vs. Murdock over and over again I have a desperate craving for the same thing happening to Matt.
Of course he'd first think that all he'd have to do is not go out that evening. But it doesn't work that way.
Foggy always finds out somehow for reasons from cracky (stumbling over Matt's costume) to angsty (Foggy getting attacked and Matt coming to the rescue and either he didn't even have the time to get into costume or Foggy figures it out anyway) to very angsty (somebody figures out Matt's identity and comes after him/Foggy somehow runs into Stick).
Eventually Matt figures out that the only we he can get out of this is by just telling Foggy everything.