I remember when me, duffman, ominub and others hit an N64 cartridge (I think the Sub zero MK game), it worked if I remember right. Then we stuck BattleTanks in the freezer, forgot about it for a few hours then took it out and it still worked. 'twas crazy but nice.
my cousin once put my SNES Zelda game in the gameshark for N64 and turned the N64 on.