Not paying your employees their salary ?

Singapore is very strict on companies not paying their employees' salaries on time. Under Singapore's Employment Act, company would need to pay their employees seven days after the salary period or within three days of employees' termination.

Failure of both may result a fine of SGD 5,000 and six months jail term for first-term offenders.

Throwing stuff from high-rise apartment might kill someone below

High-rise buildings can be seen almost every corner in Singapore and there were also cases of death due to falling objects hitting passerby. We often named this as the killer littering.

The offence carries a punishment of imprisonment for a term which may extend to 6 months, or with a fine extend to $2,500, or with both. If someone is injured due to the littering act, there might be more litigation to be faced.

Reference
1. Rash Act

I used bows to hunt in my country, can I bring it into Singapore ?

Singapore is a very tiny city and most of the forests are under nature reserve with scarce animals to be hunted down. Instead, we do have Archery Clubs in Singapore allowing those enthusiasm in Bow-ing to show off their skills.

Source: art.com

An approval is required to own Bow and Arrows in Singapore and approval can be obtained only if you are a member of the Archery Club. Furthermore, these can only be used in events or locations held by the Archery Club. So far there wasn't any case known popular that someone was fined for possession of these items.

You can't just bring Stun Gun or Pepper spray on Singapore streets

Stun Gun or Pepper spray are arms which are used for self-defence in some countries, e.g. USA which can be commonly found in weapon stores. In Singapore, you see a different picture. Basically, you would not find a weapon store anywhere in Singapore (except for authorized shop for sports shooting) that sell arms or weapon that causes bodily harm.

Source: SmartStun Blog

Perhaps because Singapore has been recognized as one of the world safest city and the government finds bringing these weapons will only disturb the order.

Possessing, import or exporting of any of these Stun Guns shall be liable for a fine not exceeding $10,000 and imprisonment term extend up to 3 years.
 
For tourists, my suggestion, it would be the best to check with your travel agent what arms are not allowed to bring into Singapore as most of the arms are prohibited. Even toy guns are prohibited.

Reference(s)
1. Arms and Explosives Act (Chapter 13) Revised Edition 2003