I came across a quote
Life isn't too funny, to be too serious
Unfortunately, I can't get the right meaning out of it, even though I'm familiar with all of the words. Can anyone explain in a much simpler form using an example?
OP probably came across the Facebook page Life Is Too Funny To Take Seriously or something similar.
The basic format X is too funny to take seriously (or more often, ...to be taken seriously) can be applied in many contexts. Obviously it would be a completely pointless thing to say about something intended to be funny/amusing (a slapstick comedy sketch, for example). So there's always some "tension" between two ways of looking at the thing (if your mother slipped on a banana skin that might seem funny to many, but probably not to you - certainly not to her - if she broke her back and was paralysed for life).
One well-known (but arguably, sick) example is The Darwin Awards (people who actually die doing stupid things, and hence improve the genetic stock of humanity by removing themselves from the gene pool). The general sentiment (for those not personally involved) can be summed up by the oft-quoted...