Because part tickles.
Cashew! she was so proud of herself for making me laugh with this one.
Because they're always dead tired. I stole this from plain and simple. Just straight up stole it. Why? Because it made me laugh and I didn't see it posted here before.
Test-tickles
Two test tickles
Because they make up an awful lot of stuff. EDIT: Because I forgot about neutrinos.
A quantum mechanic. lel