Chance encounters -- running into other cachers while searching for a cache -- don't happen that often to me. I started caching in mid 2010 but it wasn't until mid-April 2011 that an unexpected cacher showed up where I was looking. These encounters are always fun and can be extremely beneficial. I decided to recognize my first occurrence of a chance encounter by placing a cache near where that one was (the original was archived a long time ago).
An interesting aside: the other cacher was an employee at Groundspeak (name that HQ was priorly known as) but he never logged the find (I found it) and I never saw his name again.
The container is one I won at AnnScout's Community Celebration Event so if you've found some of her hides you'll know what you are looking for. Tweezers might be a good idea to have.
The ivy has been cut back so it's rather visible. Try to tuck it back into the foliage after signing the log.