A strange thing happened in London recently. A large number of Englishmen started roaring and eating
food off the floor. They were behaving like a pack of lions. No, they weren't going bananas. They were
normal people like you and me. But they watched a "therapist" on a daytime TV show. They were convinced by
him that roaring is good for you. "Roaring helps people who are uptight to relax," he said.
    The "therapist" turned out to be a hoaxer. He goes around the world playing tricks on people. It's all
for fun. So if you don't want to feel like a fool, watch out! You can't always believe what you see, read
or hear.

happen = take place = occur 发生
a large number of 可数名词   a large amount of 不可数名词
a flock of sheep, a school of fish, a herd of cattle, a pride of lion, a swarm of bees, a colony of ants  
tense 紧张的    defensive 防卫性的
scare
lunatic    hoax 哄骗