Here are some of the traps that I have come across while doing inspections.  
Some people just have too many of the wrong parts.
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BRADY HOME INSPECTION
REAL PLUMBING TRAPS OF HUMBOLT COUNTY
This trap is too deep and it's an 'S-trap'
A double trap is double trouble
Sideways mounted - no trapped water
This 'trap' is useless
I guess whoever did this had too many traps
S-Trap using flex pipe
An S-trap with flex line
This trap is too deep and uses flex line which
can clog