The definition of irrational (according to The Free Dictionary):

• Not endowed with reason
• Affected by loss of usual or normal mental clarity; incoherent, as from shock
• Marked by a lack of accord with reason or sound judgment: an irrational dislike

Well I’d like to add one more:

• Something that makes sense if you really think about it

I’ve made it known before that I have a fair amount of rational fears, but would you believe me if I told you I also have some that would be regarded as irrational?

My complaint about the definition is this:

If any of my irrational fears ever happened, they wouldn’t be irrational anymore; I’m afraid of that happening, thus rendering my fears rational.  Right?

FEAR #1 – That I’ll drive off with the gas pump still in my car.

I leave my engine running, so anything's possible. Including a fire.

FEAR #2 – That I’ll drop my keys in a sewer grate as I walk over it.

Keys please state in my pocket!

FEAR #3 – That I’ll jump over the ledge of a building if I’m on the roof.

Yeah... this one's just crazy...