Adding things like 'um' just looks silly, it's like you're trying to say 'hey I'm shy, look how shy I am, this conveys my shyness,' and it makes you look like you're simply attention-seeking rather than genuinely trying to become part of the community.
Not if you have an over-abundant amount of them and are too lazy to get a napkin (in that case, I'll clean my hands and wipe clean crumbs off of a table or something ).
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