Social skills training is a type of psychotherapy that works to help people improve their social skills so they can become socially competent. SST is predominantly a behavioural therapy but cognitive therapy can also be used in some situations to maximise the success of SST.
Often a faulty toilet ballcock (fill valve) will cause resonance sounds like these. At least it's easy to check -- here's how to tell if this is the cause. Close the supply valves to all the toilets. If the noise disappears, open them one-by-one till the noise starts again. Replace the ballcock in that toilet.
The most common cause of a malfunctioning toilet is a simple clog. Many times inappropriate items are flushed down the toilet. Often a plumber has opened up a clogged toilet only to find a child's toy blocking the pipes. If you cannot clear it with a household plunger though, the clog may be too far down the sewer line and require a professional to snake out the line.