Unless you live near a major seaport and have been victimized by a cruel coincidence, I'd say it is a common phenomenon known as "water hammer" and easily fixed. Water hammer is from ordinary vibrations in copper pipe supply lines. It is never noticed when the piping is properly braced and isolated. Check with a plumber or your hardware store expert if you think you can do it yourself. Ask about "hammer arrestors" as well.
If it is at freezing temperature, then you have an issue with uninsulated pipes.
When a toilet bubbles when flushed, it is usually due to a blockage in the plumbing system. The blockage causes air to get trapped in the pipes, leading to the bubbling effect when the toilet is flushed.
When a toilet burps when flushed, it is usually due to air trapped in the plumbing system being released. This can happen if there is a blockage or restriction in the pipes, causing air to get trapped and then released when the toilet is flushed.
I do not know if popcorn can be flushed down the toilet. So, I wouldn't try it.- Ashton Smith
Toilet bubbles appear when flushed because of air trapped in the pipes or a partial blockage in the drain. This can happen even if the toilet is not fully clogged.
The sewer
Your toilet may be leaking from the bottom when flushed due to a damaged wax ring seal or a cracked toilet base. This can cause water to seep out when the toilet is flushed. It is important to address this issue promptly to prevent further damage and water wastage.
Depends on if it needed to be flushed or not.
Bad venting
Water and waste
The toilet leaks at the base when flushed because the wax ring that seals the connection between the toilet and the floor may be damaged or worn out, allowing water to escape.
The toilet only leaks when flushed because there may be a problem with the flushing mechanism or the seal between the tank and the bowl. When the toilet is flushed, water is released from the tank into the bowl, and if there is a leak in the mechanism or seal, water can escape and cause a leak.