Way back in the day...
I was flying with my infant, and my bags were overweight. My plan had been to put on an innocent face (if weak li'l me can lift it, how can it be over 70 lbs?) and hope for the best.
The check in agent had an injured hand, so she called someone else over to put my bags on the scale while she dealt with the paperwork. When he lifted the first bag, he nearly fell over.
"lady, you can't bring such a heavy bag!" (110 lbs)
gate agent - flashing my baby's passport (my son was with my mother, not near me at all) "oh, but look how cute her baby is!"
The other agent agreed, and they let it go!