i will see the tissue phenomenon for myself when i pay a visit soon. what irks me more in sg are morons who use tissue packs to secure seats in a food court while they wait in line to get their food. i don't see this phenomenon happening anywhere in the world, except in unique sinkapoor.
learn our brother tactic, next time any one occupied the seat with tissue, just sit there and pretend didn't see it, when they said the seat has been occupied you tell them in hokkian "KNLBCCB, seah lan kong chee tao wo lan j"
if they stare at you just tell them "gua, gua si me lkan jiao, i sio kan are?" I tried that and it work man!