I was curious, so I checked my database for this month. I know that I've seen some weird stuff with less then half stacks lately. A lot of the time it is spazzing out, but the smaller the stack size the more comfortable they are about re-raising after limping. Interesting that I seen AA only 33% of the time in this spot though.

By the river it's extremely polarized... So I revert to this YouTube - Classic Movie Line #31


AA 3 times various stack size
J9s 20BB
77 64BB
98o 8BB
AKs Full Stack
K4s 40BB
AQs 40BB