well i have not met any extreme case yet
But have already seen quite a few case of people talking to
themselves while walking aimless around (i confirm that they are
not using handphone or any communication devices)
Got once inside MRT,one well built 30's looking guy got in,started
to use the steel pole to swing around,after awhile,hand clasped
onto the overhead MRT bar and begin doing pull ups,when tired,came
down swing again and repeat his pull ups until he alighted a few
stops away..