I attended a Garmin event at my university. It was very informal (sponsored bbq) so I chatted with one of the design engineers there wearing shorts and a t-shirt, handed him my resume and thought I'd hear from them in a few weeks when the career fair came around. Wrong. They called me a few hours later for a next-day interview on my university's campus.

Got a call from HR recruiter asking to set up a phone interview. Had phone interview 2 days later, several behavioral questions, and a checklist of technical questions that recruiter typed my responses. Interview seemed positive. Deferred nearly all of my questions to the potential followup interview, then declined to offer said interview. Rejection e-mails came for all open positions I had applied to, as if they hit the "flush candidate down toilet" button on me in the applicant database. No reason given.