The big thing to remember is that you make the choice to search for a cache or not. Because you may think it is inappropriate, somebody else might think it is loads of fun. The proper thing to do is to contact the cache owner and verify with him before "disturbing" the cache. If you are unsure that you found the cache, do not log it as a find. Another good point brought up, what's the fun of a decoy if you know about it. And last, nice gesture to replace the cache, but be sure to check with the owner first. I had a person move one of my caches around because they thought it was in the wrong place, but how would they know in the first place. I love to place caches that make you think...outside the box. Above all, have fun. If you don't like to play in a particular playground, find somewhere else to play that suites you better.
Cache On!!!
TacRat