your dads
u dont flush the tolet
Water hammering on any quick closing valves
On the inner rim of your toilet where the water flushes out from the cistern, if these small holes are blocked it wont make the right angled pressure to flush a toilet
The drain from the toilet to the main drain is plugged and the branch to the shower is not. If the main floor toilet flushes, it is between the two toilets and not between the house and the sewer.
If you really mean it flushes but the water does not run away, then the septic tank is plugged.
Gravity
on average of average people it would be 4.5 flushes per day (poor toilet)
To ensure your toilet flushes properly, you can regularly clean the toilet bowl and tank, check and adjust the water level in the tank, make sure the flapper is sealing properly, and avoid flushing items that can clog the toilet.
My g/f has this happen to her regularly and, it was only when I asked that she said she usually flushes once to get the flush working and then immediately after to make certain the toilet flushes everything away. She said that if a toilet has good pressure, it will often splash out when she flushes.
The noise from pipes when a toilet flushes is caused by the sudden rush of water through the pipes, creating vibrations and echoes that produce the sound.
Bubbles in your toilet when it flushes could be caused by a clog in the plumbing vent, a blockage in the drain pipe, or a malfunctioning toilet tank component. It is recommended to have a plumber inspect and diagnose the issue for proper resolution.
Many toliets are designed to save water so for some "jobs" it takes two flushes.
School prank- Putting someones head in a toilet, then flushing.
The main toilet pipe is partly plugged after where the upper pipe joins the lower one.
u dont flush the tolet
No way
Check the flapper and re-adjust the fill height.