All low-level functions on the address, so address.send(), address.call.valueQQ, address.callcode and address.delegatecall:

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Borisov Aleksandr · Accepted Answer

returning Booleans to indicate an error during execution.

Borisov Aleksandr · Answer

are interrupting execution on error, because they throw an exception.

Borisov Aleksandr · Answer

continuing execution on error silently, which is the reason why they are so dangerous.

Borisov Aleksandr · Answer

.send() throws an exception, while the other functions are returning Booleans during execution to indicate an error.

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