Maybe I'm not cool enough :(((

General note: it's a story in the past, so use past tense.

Today I came back to Shenzheng by bus. During the bus trip, I felt tired to and fell asleep while I was chewing gum. When I woke up, and I discovered the gum not was no longer in my mouth. I know the gum fallen on my belly I have swallowed the gum. :( I don't know what I could do. I don't know whether can I smile to laugh or cry...:( but I want to cry now. :(((

Have you ever done this such a stupid things? What's would happen with your body as a result?

If you swallow gum, it gets passed through your body like any other object.  It won't stick to your insides and it won't stay there for seven years. :)

"...(has/had) fallen on my belly" was confusing. It made me think the gum fell out of your mouth, onto your shirt. So you accidentally swallowed it?

"I don't know what I can/could do." is not a question, so no need for a question word-order. :)

"I don't know whether to laugh or cry." is a standard expression in English.

I'm not cool enough maybe :(((

Today I go went back to Shenzheng by bus. During the bus journey, I feel felt tired to and fell asleep while I'm chewing gum. When I wake woke up, and I discovered the gum was not in my mouth. I know the gum has fallen on in my belly. :( I don't know what can I to do. I don't know when if I can I smile or cry.:( But I want to cry now.:(((

Have you do this stupid things anything stupid like this? What's happen What happens with to your body later?

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Yes, I've done this before as well. Nothing happens. It just takes a little longer to digest. These stories of bad things happening if you swallow gum are just silly :)