Parallel Universe
Parallel Universe
[Cueball and Hairy are standing next to a large pentagram with candles at the points. A figure is hovering above it in a wave of energy.] Cueball: Sweet. I summoned myself from a parallel universe. Hairy: You know, he could vanish at any moment. Hairy: You should take this chance to make out with yourself. Hairy: . . . You know, I could vanish at any moment.

Cueball has (by some ritual, judging by the pentagram ) summoned himself from a parallel universe . Hairy suggests that Cueball should take advantage of this rare opportunity and make out with his other self.
In the third panel, Cueball seems to turn his head in response to the unexpected response. Hairy suggests that Cueball should make out with him instead, since he could also vanish at any moment. This indicates that Hairy may be attracted to Cueball, and he may have made the previous suggestion with the ulterior, voyeuristic motive of observing two attractive people making out with each other.
The title text is ambiguous. It could mean that Cueball should not risk his other self disappearing, or it could mean that the risk is Hairy disappearing.
Alternative explanation
By a very big stretch of imagination, we can think that the other person is Megan instead of Hairy (i.e. a female instead of a male).
If the character is Megan, the third panel is her having reconsidered that she would rather Cueball not make out with anyone other than her, by threatening that she would leave him.
The title text does not help in deciding if this alternative is correct or not. If it is Megan, Cueball should stay safe and not make out with himself. If it is not, he should play it safe and make out now, before his alternate self goes back to the parallel universe.
All this ambiguity suggests a third joke. Perhaps there are two universes that this is playing out in: in one of them the character is Megan; in the other it is not.
It could also be that the parallel universe that the comic takes place in is not that of the normal comics, and that the Cueball summoned could be of the standard comics. In this universe, Hairy could be the replacement for Megan.
Making out with yourself is also mentioned in 267: Choices: Part 4 .
[Cueball and Hairy are standing next to a large pentagram with candles at the points. A figure is hovering above it in a wave of energy.] Cueball: Sweet. I summoned myself from a parallel universe. Hairy: You know, he could vanish at any moment. Hairy: You should take this chance to make out with yourself. Hairy: . . . You know, I could vanish at any moment.
