Re: Regrading grabs in Aikido...
As a variation to what Alec posted:
tori stands in left kamae, left hand extended at shoulder height;
uke grabs tori's left wrist with his left hand, pushes it down, moves in a 45 degree angle to tori's back and punches with his right hand to tori's face;
tori sidesteps to the right;
uke moves further behind tori;
tori pivots on left foor to the back, extending his elbow into uke's face.
After this learning experience uke will know why to go for the other wrist as well...
Not that realistic either, but it adds to the dynamics.