I will start with one I recently received.
I have an old school friend who I have very sporadic contact with via email. When I contacted her for a catch up recently I made some reference to ‘we must get together some time,’ as you do.
She emailed me back a few days later with her news but added that she couldn’t commit to getting together this year because last year a pipe in her (adult) daughter’s bedroom had leaked and she needed to decorate her room. She doesn’t have a job or any dependent children just to be clear. 
If she’d ignored that comment although or said she was up to her eyes in it OR even said ‘not really into meeting up’ I wouldn’t have cared at all.
It made me laugh anyway. So what totally silly excuses have you been offered?