Someone try bringing a Digitech Whammy! Then when you're checked, tell the guy while you turn the knob and meddle with the pedal that "At this setting, this thing can divebomb." Haha.
Anyway, I've got randomly checked twice. Once, at Outram Park MRT. I was only carrying a sling bag with school stuff inside. While being checked, I asked the guy, "Uncle, I look like terrorist meh?" He didn't reply, he handed back my bag and walked off.
The other one was at Woodlands checkpoint, when I took a bus back to Singapore. Again, I asked the officer the same question. This time, the guy replied. He said they're not looking for terrorists. Haha. I bet he thinks I was smuggling illegal stuff or something as I was carrying lots of loose papers and some electronic stuff.