At regular (or randomly determined) intervals, the game rolls to determine whether a player will cough, sneeze, fart or burp.

Such 'unwanted release' of potentially location-revealing sound effects expand realism and bring to fore other factors which may affect a players immediate actions - surely not a bad thing.

'Magnitude' (or loudness) of a random cough/sneeze/fart/burp can be determined by health, hunger, thirst and possibly a very trendy variable: 'timesincelast' (cough/sneeze/fart/burp).

If this game is going to be #1, its gonna need stuff like this - daresay.