Reminds me of a time I was Skyped at 4 AM by a previous client who needed my help. Told him it was 4 AM in my timezone and I was well past when I needed to sleep. Offered an hour at double my usual rate for 10 minutes of work, you bet I was wide awake.
Yeah, in my case, ithe work was very very simple. Slightly tedious because I had to type up lookup tables, but once I familiarized myself with php, it didn't take 5 hours.