Probably you had bacon for breakfast!
Giardia
Tasting burnt bacon in burps can indicate that something you ate wasn't digested properly, possibly due to issues like acid reflux or indigestion. It's recommended to pay attention to your diet and eating habits, and consult a doctor if the issue persists.
Plastic...
You probably have heartburn. Take some Tums or other kind of antacid and it should go away.
It depends what kind of plastic you try, there are many different plastics. I don't know taste them for yourself!:)
Burps that taste like sulfur can be caused by sulfur-rich foods like garlic and onions, or by the breakdown of proteins in the digestive tract. It can also be a sign of gastrointestinal issues such as acid reflux or bacterial overgrowth in the gut. Drinking plenty of water and avoiding triggering foods may help reduce this issue.
When you are sick, your stomach acids may become imbalanced due to the presence of bacteria or viruses. This can cause the production of hydrogen sulfide gas, which has a sulfur-like smell similar to rotten eggs. As this gas travels up through your esophagus, it can mix with air and saliva, leading to burps that taste like eggs.
Sometimes burps may smell like rotten eggs if you have a sour stomach,
I guess he or she burps like anyone else, and nothing happens, really.
The only side effect i have ever encountered is occasional burps that have a fishy taste.
When you burp, you are releasing gas from your stomach that can contain traces of food particles and stomach acids. The taste of celery in your burps could be due to a compound called carvone found in celery that can be absorbed into your bloodstream and released when you burp. Additionally, the flavor receptors in your mouth and throat can sometimes interpret certain compounds in the gas as tasting like celery, even if you haven't recently consumed celery.