Place it as the final reaction beat after the dull moment has fully played out, not before it. Follow it with a sad violin sting for mock tragedy, or precede it with a long fake laugh to underline that nothing funny actually happened.
O tym dźwięku
A short voice clip of a speaker sighing out the Portuguese phrase "ai que tédio" over about two seconds, delivered in a flat, drawn-out tone. It captures pure boredom and mild exasperation, the drained feeling of sitting through something slow, repetitive or uninteresting and wishing it would end.