I have several:
>In a public setting, a woman is so heavily pregnant she can't lift herself up from her seat. A guy runs over to help, but struggles to lift her up.
>A guy's head sandwiched between two pregnant women, both bumps pushing into his cheeks.
>A pregnant woman pats her belly, each pat sounding like a timpani drum.
>Pregnant women bumping their bellies into people and objects, whether it's accidental or intentional.