Oh, god, did I forget her birthday? ... Or does she just want to buy me pants?
It's that panic/guilt/gratitude you feel whenever your mom is calling. Do you answer? Only if you want to be on the phone for half an hour. Still, she did painfully pop you out of her own body and raise you -- which probably included even further pain.
This BuzzFeed video pretty much summarizes the battle that occurs in the minds of every son and daughter when their mother calls.
Hmm, the phone's still ringing. And you really could use some new pants.