You can crossover any Dinosaur Comic by setting the butiwouldratherbereading variable to xkcd at the end of the URL.

For example:

https://qwantz.com/index.php?comic=4264&butiwouldratherbereading=xkcd

There’s a whole list of them I remember from like 10 years ago but I don’t know where to find them.

Dril and XKCD, together at last.

https://xkcd.com/1452/

Orion, the Well Endowed