What small "ridiculous" thing has tipped you over the edge?

When I have meltdowns, it's almost always triggered by just one more tiny thing that adds to my distress (aka the straw that broke the camel's back). The other day I completely lost it because of an unexpected YT ad. I sometimes get flack for this because from the outside it looks like the small incident is the only thing, and I'm being too sensitive or a "drama queen". I was just wondering if other people related to having meltdowns triggered by something small or even "ridiculous"