Don't just stand there. Come on in.
6 seconds sound clip from the Droopy's Double Trouble (Tex Avery, 1951) movie soundboard.
You can hear this line at 00:02:49 in the Blu-ray version of the movie.
Quote context
[...]
- Well, I don't know. Mister...
- Oh, that's great, pal! Sure 'n I'll see you at the back door.
- I'll work this little, soft-hearted runt, for everything he's got.
- Don't just stand there. Come on in.
- Now, open your mouth, shut your eyes, and I will give you a big surprise.
- Oh, so you'd rather eat on the patio, huh?
[...]