Why did I answer the phone?

A very strange thing happend today. I was at work and the phone rang it was co-worker who wanted to know If I could work for them on a Friday evening in Nov. This would mean I would not get off work until 3:00am and since I work a 2nd job on Sat which starts at 9:00am and ends at 1:00pm and I would return to the 1st job at 3:00pm and work to 11:15pm. I thought not a good idea so I said I sorry but I could not do it.
All of the sudden the co-worker goes off on me. I could not believe it. I have always help this coworker out and this is what I get. When I asked why they were so upset they would not give me answer other than they always come in for me when I ask but I never stay late when they ask. Thats real funny since this co-worker was off for 6 weeks for health reasons and I am the one who cover their shift.
How soon they forget......
So the co-worker pissed off and they tried to piss me off but no one is going to ruin the good mood I have been in for the last few days. Plus with my Mexico trip that is 18 days away no one is going to upset me.