If he has something to drink, he'll wet the bed.
4 seconds sound clip from the Home Alone (1990) movie soundboard.
You can hear this line at 00:05:30 in the Blu-ray version of the movie.
Quote context
[...]
- He just ate a whole load of mice guts. He should be good for a couple weeks.
- Is it true that French babes don't shave their pits?
- Don't you know how to knock, phlegm-wad?
- Can I sleep in your room? I don't want to sleep in the hide-a-bed with Fuller.
- If he has something to drink, he'll wet the bed.
- I wouldn't let you sleep in my room if you were growing on my ass.
- Check it out. Old man Marley.
- You ever heard of the South Bend Shovel Slayer?
- No.
- Back in '58, he murdered his whole family and half the people on his block... with a snow shovel.
[...]