What are some examples of Romeo's being irrational?William Shakespeare's Romeo and Juliet

There was a popular song in the late sixties by a female
singer in which she asks her paramour if he is a Romeo or a Heathcliff. In her song,
Romeo means the romantic lover, while Heathcliff--an allusion to the character in
Charolotte Bronte's Wuthering Heights--is the brooding lover.  Of course, the singer
uses these two male characters as prototypes.

So, the
pervading opinion of many about Romeo is that he is emotional, even overly emotional. 
As such, he does tend to become less than rational.  Certainly, it is his emotional
personality that leads him to act as impulsively as he often does.  Here are some
instances of his emotional behavior which prohibits his use of
reason:

---After first meeting Juliet, Romeo falls
hopelessly in love, climbs the fence to her orchard, drops in where a member of the
Capulet household could easily have killed him, but thinks that he is on"love's light
wings"(II,ii,30).  When she steps out onto the balcony, he tells Juliet that he would
rather die than be without her love:

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And but thou love me, let them find me her:/My
life were better ended by their hate,/than death prorogued, wanting of thy love.
(II,ii,80-83)

--Another
instance involves Romeo's Elizabethan superstition of the dark and of evil occurrences
during the dark of night:

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O blessed, blessed night!  I am afeard./Being in
night, all this is but a dream,/Too flattering-sweet to be substantial.
(II,ii,145-147)

then after
wooing Juliet, he rushes to Friar Laurence, and asks the priest to marry
them:

Then
plainly know my heart's dear love is set/On the fair daughter of rich Capulet./As mine
on hers, so hers is set on mine,...We met, we wooed and made exchange of vow,/I'll tell
thee as we pass; but this I pray,/That thou consent to marry us today.
(II,iii,51-58)

Of course,
Friar Laurence is shocked since he knows that Romeo has earlier claimed undying love
for Rosaline.  In fact, he comments on Romeo's
irrationality:

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Young men's love then lies/Not truly in their
hearts, but in their
eyes.(II,iii,61-62)

---During
the confrontation between Mercutio and Tybalt, Romeo unwisely puts himself between the
two.  This was a most unreasonable action since he could have been slain by either one
as their tempers were soaring.  Also, he does not think of how he endangers
Mercutio.

--At the news of his banishment, Romeo loses all
reason and conflicts with Friar Laurence:

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Yet 'banished?  Hang up philosophy!/Unless
philosophy can make a Juliet.
(III,iii,58-59)

To this,
Friar Laurence replies, "O, then I see that madmen have no ears," and Romeo retorts,
"How should they, when that wise men have not eyes?"
(III,iii,63)

---After the Nurse arrives at the cell of
Friar Laurence, Romeo wants to kill himself:

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O tell me, Friar, tell me,/In what vile part of
this anatomy/Doth my name lodge?  tell me, that I may sack/The hateful mansion.
(III,iii,110-113)

(After
these lines, Friar Laurence tries to reason with
Romeo.)

---Certainly, in Romeo's references to Fate, he is
irrational:  He cries,  "O, I am fortune's fool!" after learning of the decree   of the
Prince that anyone of the two families will be banished (III,i,136), and "Then, I defy
thee, stars!" (V,i,24); after Balthasar tells him that Juliet's body "sleeps in Capels'
monument."

---In the tomb of Juliet, Romeo does not try to
ascertain why Juliet's body is still warm when he supposes that she is dead because of
the news brought to him by Balthasar that he [the servant] saw that Juliet was dead a
day ago.