You remember Batman Cereal, right?
Batman Cereal (although I wish they would have called it 'Batman: The Cereal') came out in 1989 during the marketing onslaught that was the "first" Batman movie*.
*Many people believe that the 1989 Michael Keaton Batman movie is the first Batman movie - they are wrong - there were several serials in the 40's and even the Batman TV show from the 60's had a feature length film release.*
Batman Cereal was basically left over Cap'n Crunch cereal reformed into bat shapes. I remember eating box after box of it just to get these super-cool (errrrr, uhhhh, Bat-cool, I mean) coin banks. And boy, did I suffer to get each bank. For whatever reason, Batman Cereal REALLY used to cut up my cheeks and gums - but I was so Bat-crazy that I didn't care and now I have about 20 of these things up in my attic right now. Mission: Accomplished !!!!!
I never did send away for the soft glow night light (man, I should have - that could have been tomorrow's post!) but looking at the sticker on the back of the bank now - since there is no experation date it MUST still be valid. (... and yes - I really do think that way!)