Things that excite my son

Nudity

Thresholds:
egress of,
ingress of,
ledges,
precipes,
being passed through,
orifices,
doorways,
corners

Approaching or receding
appearing and disapearing

being mistaken for a telephone

being mistaken for a hand-bellows

the cat

Being the piggy that goes wee wee wee all the way home

Being any of the other piggies.

Mandarins

fires
electronics
keys

other babies.