One of the projects I'm currently working on uses ActiveReload's LightHouse application for bug tracking. Its a fairly straightforward web application written in Ruby on Rails that sells itself as "Simple to the bone" bug tracking.
This week I was tasked with working on several bugs and went into Lighthouse, ticket number in hand, ready to get started. Once I log in, I navigated to the "Tickets" page and the search form I'm presented with looks like this...

My first inclination was to put the ticket number right into the search box. No go. That didn't work, so I checked out the dropdown to the right of the search box with no sticking out at me. I then moved on to the "help" link at the end of the form where I learned they provide some pretty cool ways to search tickets... by tags, milestone, status, and even provide natural language date-based searched such as "5 days ago" or "since 1 week ago". All of these you can combine to form fairly complex searches. However, I still couldn't find a way to put in a simple ticket number and find my ticket.