
He pretends
he's in an ALTERNATE dimension...
The Big Bang Theory Season 3, Episode 7

Which only sits
on ALTERNATE years.
The Big Bang Theory Season 7, Episode 16

Even during allergy season, when he has
to ALTERNATE between kissing and breathing?
The Big Bang Theory Season 4, Episode 24

An ALTERNATE and less likely interpretation
is that you could manufacture one.
The Big Bang Theory Season 1, Episode 5

...to introduce
an ALTERNATE topic of conversation.
The Big Bang Theory Season 4, Episode 7